No, 8 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
8 has divisors other than 1 and itself. The smallest is 2: 8 ÷ 2 = 4.
Prime factorization: 8 = 2 × 2 × 2 = 2³.
| Number | Prime? |
|---|---|
| 4 | No, 2 × 2 |
| 5 | Yes |
| 6 | No, 2 × 3 |
| 7 | Yes |
| 9 | No, 3 × 3 |
| 10 | No, 2 × 5 |
| 11 | Yes |
| 12 | No, 2 × 2 × 3 |
More about 8: factors of 8 · 8 squared · square root of 8 · 8 in binary · 8 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.