No, 145 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
145 has divisors other than 1 and itself. The smallest is 5: 145 ÷ 5 = 29.
Prime factorization: 145 = 5 × 29.
| Number | Prime? |
|---|---|
| 141 | No, 3 × 47 |
| 142 | No, 2 × 71 |
| 143 | No, 11 × 13 |
| 144 | No, 2 × 2 × 2 × 2 × 3 × 3 |
| 146 | No, 2 × 73 |
| 147 | No, 3 × 7 × 7 |
| 148 | No, 2 × 2 × 37 |
| 149 | Yes |
More about 145: factors of 145 · 145 squared · square root of 145 · 145 in binary · 145 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.