Prime Number Checker
Determine primality for whole numbers up to 4,294,967,295 using bounded deterministic testing.
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How to use Prime Number Checker
Small-prime checks and deterministic Miller–Rabin witnesses 2, 7, and 61 classify integers within the supported 32-bit range. Modular arithmetic uses BigInt.
- Enter nonnegative whole number.
- Check that the input follows the stated limits and uses consistent units.
- Run the calculator, review the result, then copy or download it.
Good to know
- Only integers from 0 to 4,294,967,295 are accepted. This is not a cryptographic key generator and does not factor composite values.
- Decimal inputs have at most 120 characters and magnitude from 1e-100 to 1e15, or zero. Floating-point results are rounded to 12 significant digits; extreme derived results may underflow or be rejected. Exact integer results are identified separately.
Common questions
What calculation does Prime Number Checker perform?
Small-prime checks and deterministic Miller–Rabin witnesses 2, 7, and 61 classify integers within the supported 32-bit range. Modular arithmetic uses BigInt.
Is 1 a prime number?
No. A prime has exactly two positive divisors. Zero and one are neither prime nor composite.
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