Prime Number Checker
Calculate prime number instantly in your browser.
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What this tool does
Calculate prime number instantly in your browser. Deterministic trial division limited to 10¹² to keep browser computation bounded.
How to use the Prime Number Checker
- Enter or select whole integer (up to 10¹²).
- Read the calculated result; change any measurement to compare alternatives.
Formula
trial division by 2, 3, then candidates 6k±1 through sqrt(n)
- value
- Whole integer (up to 10¹²)
Deterministic trial division limited to 10¹² to keep browser computation bounded.
Worked example
For prime number checker, the following measurements illustrate the exact method: Whole integer (up to 10¹²): 97.
Inputs
- Whole integer (up to 10¹²)97
Result
- ClassificationPrime
Results explained
- Classification
- Classification from the formula above. Deterministic trial division limited to 10¹² to keep browser computation bounded.
Frequently asked questions
trial division by 2, 3, then candidates 6k±1 through sqrt(n)
Deterministic trial division limited to 10¹² to keep browser computation bounded.
Where mathematically meaningful, yes. Fields specify permitted ranges and undefined operations display an error.
Exact integer calculations use safe integers; decimal calculations use browser floating point, so small rounding differences can occur.
All values remain in your browser and are never uploaded.