No, 125 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
125 has divisors other than 1 and itself. The smallest is 5: 125 ÷ 5 = 25.
Prime factorization: 125 = 5 × 5 × 5 = 5³.
| Number | Prime? |
|---|---|
| 121 | No, 11 × 11 |
| 122 | No, 2 × 61 |
| 123 | No, 3 × 41 |
| 124 | No, 2 × 2 × 31 |
| 126 | No, 2 × 3 × 3 × 7 |
| 127 | Yes |
| 128 | No, 2 × 2 × 2 × 2 × 2 × 2 × 2 |
| 129 | No, 3 × 43 |
More about 125: factors of 125 · 125 squared · square root of 125 · 125 in binary · 125 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.