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How to use Prime Number Checker

Get the best out of Prime Number Checker: every option explained, a worked example, and what to check when the output is not what you expected.

Updated July 31, 2026

What it does

Verify prime numbers and instantly calculate divisors. It runs entirely in your browser — your input never leaves your device.

Every setting this tool exposes, straight from the code that validates it.

Option	Type	Default	What it does
`number`	whole number	—	A non-negative integer to test for primality. Accepts min 0. Required.

Run these settings on the tool page:

You get:

{
  "number": 2,
  "isPrime": true,
  "primeFactors": []
}

Nothing happens / the output stays empty. number is required — the tool waits until you provide it.
A value is rejected. number accepts min 0. Anything outside that is refused rather than silently clamped.
It is slow on very large input. Everything runs in your browser, so speed depends on your device. Very large inputs are best split up, or run through the API where the work happens on our servers.

The same logic is available as a REST endpoint, so you can run it from a script, a CI job or your own app.


Bash
curl "https://api.toolsxpo.com/v1/prime-number-checker" \
  -H "Authorization: Bearer $TOOLSXPO_KEY"

It costs 1 credit per successful call. See the full endpoint reference, or try it in the playground.

Prime Number Checker

Math

math

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