No, 77 is not a prime number. It is a composite number: 77 = 7 × 11.
77 has divisors other than 1 and itself. The smallest is 7: 77 ÷ 7 = 11.
Prime factorization: 77 = 7 × 11.
| Number | Prime? |
|---|---|
| 73 | Yes |
| 74 | No, 2 × 37 |
| 75 | No, 3 × 5 × 5 |
| 76 | No, 2 × 2 × 19 |
| 78 | No, 2 × 3 × 13 |
| 79 | Yes |
| 80 | No, 2 × 2 × 2 × 2 × 5 |
| 81 | No, 3 × 3 × 3 × 3 |
More about 77: factors of 77 · 77 squared · square root of 77 · 77 in binary · 77 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.