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Prime Number Checker
Check whether a number is prime or composite, and find all prime factors with a complete factorization breakdown.
Check a Number
Generate Primes up to N
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Frequently Asked Questions
Prime Number Checker is a free online tool that helps you check whether a number is prime or composite, and find all prime factors with a complete factorization breakdown. It runs entirely in your browser — no sign-up or installation required.
Yes, Prime Number Checker is completely free. There are no hidden charges, subscriptions, or account requirements. You can use it as many times as you like.
Prime Number Checker uses industry-standard algorithms and formulas to ensure accurate results. All calculations are performed locally in your browser for speed and privacy. If you spot an issue, please let us know via the Contact page.