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Prime Number Checker

Check if a number is prime, get its prime factorization, and find Nth prime numbers.

Enter a Number

List First N Primes

Prime Number Checker — Frequently Asked Questions

Enter a number and it tests divisibility to tell you instantly whether the number is prime or composite.

A prime number is a whole number greater than 1 that has exactly two divisors: 1 and itself.

Yes, it can also generate a list of the first prime numbers for study and reference.