No, 205 is not a prime number. It is a composite number: it ends in 5, so it is divisible by 5.
205 has divisors other than 1 and itself. The smallest is 5: 205 ÷ 5 = 41.
Prime factorization: 205 = 5 × 41.
| Number | Prime? |
|---|---|
| 201 | No, 3 × 67 |
| 202 | No, 2 × 101 |
| 203 | No, 7 × 29 |
| 204 | No, 2 × 2 × 3 × 17 |
| 206 | No, 2 × 103 |
| 207 | No, 3 × 3 × 23 |
| 208 | No, 2 × 2 × 2 × 2 × 13 |
| 209 | No, 11 × 19 |
More about 205: 205 in binary.
Another number? Use the prime number checker for any value, or see the list of prime numbers.