Prime Number Checker

To use this prime number checker, enter your number below and hit the green generate button.

YES 2 is a prime number

What is this tool?

A prime number is a number greater than 1 that is only divisible by itself and one. Smaller numbers are relatively easy to figure out as primes, for example, 2, 3, 5, 7 and 11 are all prime, however, it can be tricky checking if large numbers are primes.

To quickly find out if any number is a prime you can use this prime number checker. Enter the number to check, click/tap the generate button and it will immediately tell you if the number you entered is a prime.