Is 109 Prime?

A prime number is a natural number greater than 1 that has exactly two factors: 1 and itself.

To check if 109 is prime, we need to verify that no number from 2 to √109 divides it evenly.

Since 109 is odd, we only need to check odd divisors.

We only need to test up to √109 ≈ 10.44, which rounds down to 10.

If 109 has a factor larger than √109, it must also have a corresponding factor smaller than √109.

Testing: 3, 5, 7, ... up to 10

None of these numbers divide 109 evenly.

109 has no divisors between 2 and 10.

The only factors of 109 are 1 and 109 itself.

Therefore, 109 is a PRIME number!