Prime Number Checker & Generator
Check if a number is prime, or list every prime number up to a limit, instantly.
Pourquoi utiliser cet outil ?
Checking primality by hand for large numbers is tedious. This tool checks any number instantly and can also list every prime up to a limit you set, directly in your browser.
Why it's free
A discreet ad banner covers hosting costs — that's the whole business model. No account to create, no usage limit, no paid tier unlocking the real result. Calculations run in your browser, so your numbers, dates and text never leave your device.
How our tools work