Yes, 29 is a prime number. Its only factors are 1 and 29.
A number is prime if no smaller prime up to its square root divides it. The square root of 29 is about 5.39, so it is enough to test the primes 2, 3 and 5.
| Divide by | Remainder | Divides evenly? |
|---|---|---|
| 2 | 1 | No |
| 3 | 2 | No |
| 5 | 4 | No |
None of them divides 29 evenly, so 29 is prime.
| Number | Prime? |
|---|---|
| 25 | No, 5 × 5 |
| 26 | No, 2 × 13 |
| 27 | No, 3 × 3 × 3 |
| 28 | No, 2 × 2 × 7 |
| 30 | No, 2 × 3 × 5 |
| 31 | Yes |
| 32 | No, 2 × 2 × 2 × 2 × 2 |
| 33 | No, 3 × 11 |
More about 29: factors of 29 · 29 squared · square root of 29 · 29 in binary · 29 in Roman numerals.
Another number? Use the prime number checker for any value, or see the list of prime numbers.