Prime Number Checker
Check if a number is prime and see its factors if not.
97 is a prime number
How to use Prime Number Checker
- 1Enter a positive integer.
- 2See instantly whether it's prime, plus its factors if not.
Why use this tool
- Handles large numbers efficiently using trial division up to the square root.
- Shows prime factorization for composite numbers.
Frequently asked questions
Is 1 a prime number?
No — by definition, 1 is neither prime nor composite. Primes must be greater than 1.