Check whether a number is prime, break it into prime factors, list all its divisors and find the next prime number.
loading toolHow to use the prime number checker
- Type your numbers in the boxes (pick your currency or units if asked).
- The answer updates as you type: no button to press.
- Copy the result, or share it on WhatsApp with one tap.
Questions
Is 1 a prime number?
No. A prime has exactly two divisors: 1 and itself. 2 is the only even prime.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
