Prime Checker & Generator
Check the primality of any integer or compile tables of prime numbers offline.
Processed locally in your browser — nothing is uploaded.
How to Use
- Use the checker tab to test specific numbers.
- Or use the generator tab to list all primes up to a set range.
- Review divisor details.
FAQ
What is a prime number?
A prime number is a positive integer greater than 1 that has no positive divisors other than 1 and itself.