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Open toolPrime number checker
Check whether a whole number is prime.
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THE QUICK GUIDE
How to use prime number checker
Enter the labelled values, then process it. Copy or download the result.
How it works
Checks divisibility up to the square root; primes are integers greater than 1.
A useful example
Whole number (0–10¹²): 97 → 97 is prime.
Good to know
Use consistent units and currency. These are general calculations; verify important results.