No, 75 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
75 has divisors other than 1 and itself. The smallest is 3: 75 ÷ 3 = 25.
Prime factorization: 75 = 3 × 5 × 5 = 3 × 5².
| Number | Prime? |
|---|---|
| 71 | Yes |
| 72 | No, 2 × 2 × 2 × 3 × 3 |
| 73 | Yes |
| 74 | No, 2 × 37 |
| 76 | No, 2 × 2 × 19 |
| 77 | No, 7 × 11 |
| 78 | No, 2 × 3 × 13 |
| 79 | Yes |
More about 75: factors of 75 · 75 squared · square root of 75 · 75 in binary · 75 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.