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Prime Checker

Prime Checker — pure client-side tool. Privacy-first, no server round-trip.

Try an example:
Local only

Recent history

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How to use

  1. Type or paste your input into the input box.
  2. Adjust any parameters if needed.
  3. Copy or download the result.

Frequently asked questions

What does Prime Checker do?
Prime Checker processes your input entirely in the browser.
Is my data uploaded anywhere?
No. All processing happens locally with no server round-trip.

Tutorials using this tool

How to Test Primality
An intermediate-level guide covering primality, prime, number-theory. Includes step-by-step instructions, common errors, troubleshooting tips, and security considerations for primality.
TUTORIAL

Glossary terms

Related tasks

Factor integers into primes
Integer factorization decomposes a number into its prime factors. Learn trial division, Pollard's rho, and why factoring is hard.
TASK
Generate prime numbers
Generate primes for cryptographic keys and number theory. Learn sieves, primality testing, and safe prime generation.
TASK
Test if a number is prime
Primality testing determines if a number is prime. Learn trial division, Miller-Rabin, and deterministic tests.
TASK
Use elliptic curves for cryptography
Elliptic curve cryptography (ECC) provides the same security as RSA with much smaller keys. Learn point operations and key exchange.
TASK

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