Step 1: Understand what a prime number is. A prime number is a natural number greater than 1 that can only be divided by 1 and itself without leaving a remainder.
Step 2: Identify the numbers given in the question. Look for the number that can be divided by other numbers besides 1 and itself.
Step 3: Check the number 9. See if it can be divided by any number other than 1 and 9.
Step 4: Notice that 9 can be divided by 3 (since 9 ÷ 3 = 3). This means 9 has divisors other than 1 and itself.
Step 5: Conclude that since 9 can be divided by 3, it is NOT a prime number.
