prime factorization

Prime Factorization

Understand concepts involved in topic prime factorization

Last updated : 29 June 2024, Saturday

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Prime factorization is a fundamental concept in mathematics that involves breaking down a number into its prime components. It serves as the foundation for various mathematical and computational algorithms, making it an essential skill for students and enthusiasts. In this article, we will delve into the world of prime factorization, exploring its significance, methods, and real-world applications. Prime factorization involves expressing a given integer as a product of its prime factors. This process not only provides a unique representation of the number but also allows for a deeper understanding of its mathematical properties.

prime factorization definition

Factors and Multiples

A factor is a term used in mathematics to describe a number or expression that can be evenly divided into another number or expression without leaving a remainder.

A multiple is a number that can be evenly divided by another number. In other words, when one number is a multiple of another, it means that the first number can be obtained by multiplying the second number by an integer (a whole number).

Methods of prime factorisation

  1. Trial Division Method
  • The trial division method involves dividing the number by progressively larger prime numbers.
  • Start with the smallest prime number (2) and continue to divide until the number is no longer divisible by the current prime.
  • Record each prime factor and continue with the quotient until it becomes 1.

For example, let’s find the prime factors of 36 using trial division:

  • Start with 2: 36 ÷ 2 = 18
  • Continue with 2: 18 ÷ 2 = 9
  • Continue with 3: 9 ÷ 3 = 3
  • Continue with 3: 3 ÷ 3 = 1

The prime factors of 36 are 2 and 3

  1. Prime Factorisation Tree
  • Another method involves constructing a factorization tree, which visually represents the prime factors of a number.
  • Start by dividing the number by its smallest prime factor and write down the quotient.
  • Continue this process for each quotient until you reach 1, and then collect all the prime factors from the tree.
prime factorization tree


Prime factorization has numerous practical applications in mathematics, computer science, and cryptography. Here are a few areas where it plays a crucial role:

  1. Cryptography: Prime factorization is at the heart of encryption techniques like RSA (Rivest-Shamir-Adleman). The security of these systems relies on the difficulty of factoring the product of two large prime numbers.
  2. Number Theory: Prime factorization is an essential tool for solving various problems in number theory, such as finding the greatest common divisor (GCD) and the least common multiple (LCM) of numbers.
  3. Algorithms: Prime factorization algorithms are used in computer science for tasks like simplifying fractions, reducing fractions to their lowest terms, and solving diophantine equations.
  4. Computational Mathematics: In computational mathematics, prime factorization is used in tasks like integer factorization, which has applications in solving complex mathematical problems and simulating physical systems.


Prime Factorization

Questions 1-10 have single answer correct

Questions 11-20 have one or more answers correct

1 / 20

What is the prime factorization of 196?

2 / 20

Which of the following is the prime factorization of 72?

3 / 20

What is the prime factorization of 60?

4 / 20

Which of the following is a prime factor of 91?

5 / 20

What is the prime factorization of 81?

6 / 20

The prime factorization of 210 is:

7 / 20

Find the prime factorization of 1024.

8 / 20

Which of the following numbers is a prime factor of 45?

9 / 20

What is the prime factorization of 125?

10 / 20

If a number is divisible by 6 and 15, which prime number must be a factor of it?

11 / 20

Choose all correct prime factorizations of 72.

12 / 20

Select all prime factors of 48

13 / 20

Which of these sets of numbers are the prime factors of 100?

14 / 20

Identify all prime factors of 56.

15 / 20

Which of the following numbers are prime factors of 210?

16 / 20

What is the prime factorization of 60?

17 / 20

Select all prime factors of 126

18 / 20

Which of the following are prime factors of 84?

19 / 20

Identify the prime factors of 45.

20 / 20

Choose all the prime factors of 132.

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