Glossary › Maths and statistics
Prime number
A whole number greater than 1 that only divides by 1 and itself.
97 is prime. 91 looks prime and is not: it is 7 × 13. When a number is not prime, Ratio shows its factors.
In Ratio
| You type | Ratio shows |
|---|---|
isprime(91) | not prime: 7 × 13 |
isprime(97) | prime |