No, 168 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
168 has divisors other than 1 and itself. The smallest is 2: 168 ÷ 2 = 84.
Prime factorization: 168 = 2 × 2 × 2 × 3 × 7 = 2³ × 3 × 7.
| Number | Prime? |
|---|---|
| 164 | No, 2 × 2 × 41 |
| 165 | No, 3 × 5 × 11 |
| 166 | No, 2 × 83 |
| 167 | Yes |
| 169 | No, 13 × 13 |
| 170 | No, 2 × 5 × 17 |
| 171 | No, 3 × 3 × 19 |
| 172 | No, 2 × 2 × 43 |
More about 168: factors of 168 · square root of 168 · 168 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.