No, 771 is not a prime number. It is a composite number: its digits add up to 15, which is divisible by 3, so 771 is divisible by 3.
771 has divisors other than 1 and itself. The smallest is 3: 771 ÷ 3 = 257.
Prime factorization: 771 = 3 × 257.
| Number | Prime? |
|---|---|
| 701 | Yes |
| 713 | No, 23 × 31 |
| 721 | No, 7 × 103 |
| 743 | Yes |
| 791 | No, 7 × 113 |
| 801 | No, 3 × 3 × 89 |
| 811 | Yes |
| 821 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.