No, 280 is not a prime number. It is a composite number: it is even, so it is divisible by 2.
280 has divisors other than 1 and itself. The smallest is 2: 280 ÷ 2 = 140.
Prime factorization: 280 = 2 × 2 × 2 × 5 × 7 = 2³ × 5 × 7.
| Number | Prime? |
|---|---|
| 276 | No, 2 × 2 × 3 × 23 |
| 277 | Yes |
| 278 | No, 2 × 139 |
| 279 | No, 3 × 3 × 31 |
| 281 | Yes |
| 282 | No, 2 × 3 × 47 |
| 283 | Yes |
| 284 | No, 2 × 2 × 71 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.