No, 387 is not a prime number. It is a composite number: its digits add up to 18, which is divisible by 3, so 387 is divisible by 3.
387 has divisors other than 1 and itself. The smallest is 3: 387 ÷ 3 = 129.
Prime factorization: 387 = 3 × 3 × 43 = 3² × 43.
| Number | Prime? |
|---|---|
| 383 | Yes |
| 384 | No, 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 |
| 385 | No, 5 × 7 × 11 |
| 386 | No, 2 × 193 |
| 388 | No, 2 × 2 × 97 |
| 389 | Yes |
| 390 | No, 2 × 3 × 5 × 13 |
| 391 | No, 17 × 23 |
Another number? Use the prime number checker for any value, or see the list of prime numbers.