No, 140 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
140 has divisors other than 1 and itself. The smallest is 2: 140 ÷ 2 = 70.
Prime factorization: 140 = 2 × 2 × 5 × 7 = 2² × 5 × 7.
| Number | Prime? |
|---|---|
| 136 | No, 2 × 2 × 2 × 17 |
| 137 | Yes |
| 138 | No, 2 × 3 × 23 |
| 139 | Yes |
| 141 | No, 3 × 47 |
| 142 | No, 2 × 71 |
| 143 | No, 11 × 13 |
| 144 | No, 2 × 2 × 2 × 2 × 3 × 3 |
More about 140: factors of 140 · 140 squared · square root of 140 · 140 in binary · 140 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.