Prime Number Checker
Check if a number is prime, see its factorization, and list primes in a range.
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25 primes found up to 100
Frequently Asked Questions
What is a prime number?
A prime number is a natural number greater than 1 that has no divisors other than 1 and itself. Examples: 2, 3, 5, 7, 11, 13.
Is 1 a prime number?
No. 1 is neither prime nor composite by mathematical convention. The smallest prime number is 2.