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Free Online Prime Number Checker

Test integer primality using bounded trial division.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Prime Number Checker
Test integer primality using bounded trial division. Integers from 0 to 10^12 are supported. 0 and 1 are not prime. Trial division is bounded by the square root; larger numbers are rejected.
  1. Set Number.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Test integer primality using bounded trial division. The example below demonstrates Number.
Example input:
{
  "a": 97
}
Expected result (relevant fields):
{
  "result": true
}
Features & result limitations
Integers from 0 to 10^12 are supported. 0 and 1 are not prime. Trial division is bounded by the square root; larger numbers are rejected.
Frequently asked questions
What inputs does Prime Number Checker accept?
Number
How should I interpret the Prime Number Checker result?
Integers from 0 to 10^12 are supported. 0 and 1 are not prime. Trial division is bounded by the square root; larger numbers are rejected.
Where does Prime Number Checker process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.