Prime Number Calculator
Check if a number is prime, find primes in a range, or get prime factors
About Prime Numbers
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.
FAQ
What is a prime number?
A prime number is a whole number greater than 1 that cannot be exactly divided by any whole number other than itself and 1.
Is 1 a prime number?
No, 1 is not considered a prime number. Prime numbers must have exactly two distinct factors: 1 and itself.
What is the smallest prime number?
The smallest prime number is 2. It's also the only even prime number.