Yes, 1,049 is a prime number. Its only factors are 1 and 1,049.
A number is prime if no smaller prime up to its square root divides it. The square root of 1,049 is about 32.39, so it is enough to test the primes 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31.
| Divide by | Remainder | Divides evenly? |
|---|---|---|
| 2 | 1 | No |
| 3 | 2 | No |
| 5 | 4 | No |
| 7 | 6 | No |
| 11 | 4 | No |
| 13 | 9 | No |
| 17 | 12 | No |
| 19 | 4 | No |
| 23 | 14 | No |
| 29 | 5 | No |
| 31 | 26 | No |
None of them divides 1,049 evenly, so 1,049 is prime.
| Number | Prime? |
|---|---|
| 1,000 | No, 2 × 2 × 2 × 5 × 5 × 5 |
| 1,001 | No, 7 × 11 × 13 |
| 1,009 | Yes |
| 1,024 | No, 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 |
| 1,111 | No, 11 × 101 |
| 1,201 | Yes |
| 1,231 | Yes |
| 1,297 | Yes |
Another number? Use the prime number checker for any value, or see the list of prime numbers.