Is 18 Prime?

Check if 18 is a prime number. A prime number is only divisible by 1 and itself.

Result: ✗ NO — 18 is NOT a prime number

Step-by-Step Solution

Step 1 What is a Prime Number?

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

To check if 18 is prime, we need to verify that no number from 2 to √18 divides it evenly.

Step 2 Check if Even

18 is an even number because 18 ÷ 2 = 9 with no remainder.

All even numbers greater than 2 are divisible by 2, so they have at least three factors: 1, 2, and themselves.

Therefore, 18 is NOT prime.