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Prime Number Checker

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Check if a number is prime — find prime factors

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97 is a prime number
Browser-based, files never uploaded Instant results Works on any device

How to use Prime Number Checker

  1. 1Enter any positive integer
  2. 2See if it is prime instantly
  3. 3View prime factorization

About this tool

Check if any number is prime online. Find prime factorization. List prime numbers up to N.

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Frequently asked questions

What is the largest prime this checks?

Works for numbers up to 10^15 using Miller-Rabin primality test.