Is 43 Prime?

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

To check if 43 is prime, we need to verify that no number from 2 to √43 divides it evenly.

Since 43 is odd, we only need to check odd divisors.

We only need to test up to √43 ≈ 6.56, which rounds down to 6.

If 43 has a factor larger than √43, it must also have a corresponding factor smaller than √43.

Testing: 3, 5, 7, ... up to 6

None of these numbers divide 43 evenly.

43 has no divisors between 2 and 6.

The only factors of 43 are 1 and 43 itself.

Therefore, 43 is a PRIME number!