ToolsXpo

Prime Number Checker

Verify if a number is prime and instantly calculate its divisors if it is composite.

This tool has an API.Automate it from your code — 1 credit/call.Open in Playground
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Examples & Use Cases

Input Integer

15

Result (Composite)

{ "number": 15, "isPrime": false, "factors": [1, 3, 5, 15] }

Prime Number Verification

Prime numbers are integers greater than 1 that have no divisors other than 1 and themselves. They are the fundamental building blocks of modern cryptography (like RSA). Our Prime Number Checker runs a highly optimized browser-side algorithm to instantly verify primes and extract factors for composite numbers.

About Prime Number Checker

Verify if a number is prime and instantly calculate its divisors if it is composite. It's built for calculations and quantitative checks, runs instantly, and works on any device — no install, no sign-up.

How to use Prime Number Checker

  1. Paste or type your input into the editor on the left.
  2. Leave the defaults, or tweak them if the tool exposes options.
  3. The result appears instantly on the right — everything runs in your browser, so nothing is uploaded.
  4. Copy the output, or download it, and you're done.

Why use Prime Number Checker?

  • Fast and local — the transform happens in your browser, so there's no round-trip and no waiting.
  • Private by default — your input never leaves your device.
  • Accurate — the same, well-tested logic powers both this page and the public API.
  • Free — unlimited use in the browser, with an optional API for automation.

Use it from the API

Everything this page does is also available as a REST endpoint, so you can call Prime Number Checker from your own code, a script or a CI pipeline.

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

The endpoint returns a JSON envelope ({ ok, data, meta }) and costs 1 credit per successful call. Try it in the playground or browse the full API reference.

Frequently asked questions

Is Prime Number Checker free to use? Yes — use it in the browser as much as you like. The optional API has a free tier and pay-as-you-go pricing for heavy or automated use.

Is my data private? Yes. Prime Number Checker runs entirely in your browser — your input never leaves your device and nothing is logged or stored.

Can I automate Prime Number Checker? Yes — call the prime-number-checker API endpoint from any language and script it into your workflow.

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