Prime Number Calculator
Jenzzy checks divisibility up to √n and enumerates primes for education and puzzles.
Inputs
Results
Enter values to see results.
Formula
n prime if no divisor d with 2 ≤ d ≤ √n
Trial division suffices for moderate sizes; sieve methods scale for ranges.
Example
- Test divisors: 2 through 9
- Result: No divisors= Prime
Result: 97 is prime
Frequently Asked Questions
1 prime?
By modern definition, 1 is neither prime nor composite.
Large numbers?
Probabilistic tests used for cryptography-scale values.
Twin primes?
Pairs like 11,13 differ by 2—still an open research area.