Prime Number Checker
Enter a number to check if it is prime, list primes in a range, or find the prime factorization.
About Prime Numbers
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
Trial division: if a number is not divisible by any integer from 2 to โn, it is prime.
Primes are infinite: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37 ...