Is prime? / next prime calculator
Test whether an integer is prime and find the next prime greater than or equal to a starting value.
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Tool guide
Is prime? / next prime calculator: how it works
Practical information to understand the result and use this tool correctly.
About Is prime? / next prime calculator
Primes have exactly two positive divisors: 1 and themselves.
The tool labels n as prime, composite, or neither (for n ≤ 1).
Next-prime helpers are useful for hashing examples and number-theory drills.
How to use it
- 1Enter an integer.
- 2Read prime/composite status.
- 3Use the next-prime cards as needed.
Frequently asked questions
- Is 2 prime?
- Yes — the only even prime.
- Negatives?
- Primality is defined for positive integers; the tool uses |n|.