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Prime Number Checker
Enter a number to check if it is prime using a fast trial-division test. Runs in your browser with no sign-up required. Keeps your data private on-device.
How to use this tool
- Enter an integer to test primality.
- Review prime/composite status, nearest neighboring primes, and small divisors.
- Copy or export the result summary for learning or engineering workflows.
Common uses
- Quickly screen numbers in algorithm and cryptography exercises.
- Generate classroom examples of composite values and factors.
- Explore prime gaps by checking sequential integer ranges.
Limits and behavior
- This implementation targets practical small-to-mid integer checks.
- Inputs are treated as integers for deterministic trial-division analysis.
- Only small divisor previews are shown to keep the interface responsive.
FAQ
- Does it support very large cryptographic integers?
- Not for production-scale cryptography. Very large primes require big-integer arithmetic and probabilistic tests.
- Why are not all divisors listed?
- The tool emphasizes quick diagnosis and shows a bounded divisor preview rather than exhaustive factorization.
- How are negative numbers handled?
- Negative values are not prime by definition; primes are positive integers greater than 1.
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