No, 99 is not a prime number. It is a composite number: its digits add up to 18, which is divisible by 3, so 99 is divisible by 3.
99 has divisors other than 1 and itself. The smallest is 3: 99 ÷ 3 = 33.
Prime factorization: 99 = 3 × 3 × 11 = 3² × 11.
| Number | Prime? |
|---|---|
| 95 | No, 5 × 19 |
| 96 | No, 2 × 2 × 2 × 2 × 2 × 3 |
| 97 | Yes |
| 98 | No, 2 × 7 × 7 |
| 100 | No, 2 × 2 × 5 × 5 |
| 101 | Yes |
| 102 | No, 2 × 3 × 17 |
| 103 | Yes |
More about 99: factors of 99 · 99 squared · square root of 99 · 99 in binary · 99 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.