Prime Factorization Calculator

Use this free prime factorization calculator to rewrite a positive whole number as prime factors, see repeated factors as exponents, and check whether the number is prime.

All tools

Prime factors Power form Prime check Copy results

Whole number

6 prime factors2^3 x 3^2 x 5

Factor count: 24
Factor pairs: 12
Prime factors: 2^3 x 3^2 x 5

Steps

Start with 360 and try the smallest prime factor first.
Divide by that prime until it no longer divides evenly, then move to the next prime.
Group repeated primes as powers: 2^3 x 3^2 x 5.
As a check, multiply the prime factors back to get 360.

How to use the prime factorization calculator

Enter one positive whole number.
Press Factor into primes to break it into prime factors.
Review repeated prime factors as exponents and check whether the number is prime.
Use examples, recent answers, or copy the result while checking factorization work.

Common uses

Rewrite a number as prime factors for homework or study notes.

Check whether a number is prime or composite.

Compare prime factorization with factors, GCF, and LCM work.

Break down numbers before simplifying fractions or ratios.

Examples

Factor a composite number 360

2^3 x 3^2 x 5

Check a prime number 9973

9973 is prime

Break down a highly composite number 5040

2^4 x 3^2 x 5 x 7

Frequently asked questions

Quick answers about prime factors, repeated factors, exponents, prime checks, input limits, and privacy.

What does prime factorization mean?

Prime factorization rewrites a whole number as prime numbers multiplied together. For example, 360 becomes 2^3 x 3^2 x 5.

What is a prime number?

A prime number is a whole number greater than 1 with exactly two positive factors: 1 and itself.

Why do repeated prime factors become exponents?

Exponents keep repeated factors short. Instead of writing 2 x 2 x 2, the calculator writes 2^3.

How is this different from the Factor Calculator?

The Factor Calculator lists every factor and factor pair. This calculator focuses on the prime factors that multiply back to the original number.

What numbers can I enter?

Enter one positive safe whole number up to 1,000,000,000,000. Very large factorization can be slow, so this browser calculator keeps a practical limit.

Is my number sent to a server?

No. The calculation runs in your browser tab and recent answers stay only in that tab while you use the page.