Below is a *prime number calculator*, which will tell you if a number you input is a prime. If it isn’t, it’ll list the factors of the number.

*Also see the closely related prime factorization calculator.*

## Prime Number Calculator

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## What is a Prime Number?

A prime number is a positive integer or natural number which cannot be divided evenly by any other integers other than itself and 1.

Prime numbers have many applications, including in factoring and cryptography.

## Using the Prime Number Calculator

To use the prime value calculator, enter the number you’d like to check in the **Number to Check for Prime** box. Then, click the **Is it a Prime Number?** button.

We’ll tell you if its a prime in the text box below. If it is not a prime number, we’ll also include the factors we found.

*Afterwards, try our other calculators and tools.*