No, 138 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
138 has divisors other than 1 and itself. The smallest is 2: 138 ÷ 2 = 69.
Prime factorization: 138 = 2 × 3 × 23.
| Number | Prime? |
|---|---|
| 134 | No, 2 × 67 |
| 135 | No, 3 × 3 × 3 × 5 |
| 136 | No, 2 × 2 × 2 × 17 |
| 137 | Yes |
| 139 | Yes |
| 140 | No, 2 × 2 × 5 × 7 |
| 141 | No, 3 × 47 |
| 142 | No, 2 × 71 |
More about 138: factors of 138 · 138 squared · square root of 138 · 138 in binary · 138 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.