No, 68 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
68 has divisors other than 1 and itself. The smallest is 2: 68 ÷ 2 = 34.
Prime factorization: 68 = 2 × 2 × 17 = 2² × 17.
| Number | Prime? |
|---|---|
| 64 | No, 2 × 2 × 2 × 2 × 2 × 2 |
| 65 | No, 5 × 13 |
| 66 | No, 2 × 3 × 11 |
| 67 | Yes |
| 69 | No, 3 × 23 |
| 70 | No, 2 × 5 × 7 |
| 71 | Yes |
| 72 | No, 2 × 2 × 2 × 3 × 3 |
More about 68: factors of 68 · 68 squared · square root of 68 · 68 in binary · 68 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.