Yes, 83 is a prime number. Its only factors are 1 and 83.
A number is prime if no smaller prime up to its square root divides it. The square root of 83 is about 9.11, so it is enough to test the primes 2, 3, 5 and 7.
| Divide by | Remainder | Divides evenly? |
|---|---|---|
| 2 | 1 | No |
| 3 | 2 | No |
| 5 | 3 | No |
| 7 | 6 | No |
None of them divides 83 evenly, so 83 is prime.
| Number | Prime? |
|---|---|
| 79 | Yes |
| 80 | No, 2 × 2 × 2 × 2 × 5 |
| 81 | No, 3 × 3 × 3 × 3 |
| 82 | No, 2 × 41 |
| 84 | No, 2 × 2 × 3 × 7 |
| 85 | No, 5 × 17 |
| 86 | No, 2 × 43 |
| 87 | No, 3 × 29 |
More about 83: factors of 83 · 83 squared · square root of 83 · 83 in binary · 83 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.