Prime Checker
Test whether a number is prime.
Input Data
N
Results
Yes/No (prime or not).
1
Explanatory note about the result.
17 是質數（因數：1, 17）。
At a glance:n is prime if it has no divisor d with 1<d<√n. Complements prime-checker and factorization.
Formula
test divisors up to √n.
How to Use
- Enter an integer.
- The tool reports whether it is prime.
Case Studies
17
prime.
FAQ
Is 1 prime?
No — by definition primes are greater than 1.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.