If a number has more than two factors, it is called a composite number. All even numbers have 2 as a factor because they are divisible by 2. Thus, even numbers other than 2 cannot be prime.
All other even numbers are classified as composite numbers. A composite number is a positive number that has at least one positive factor other than itself and 1. Four is the smallest composite number.
The number 1 is called a special number, as it has only one factor. It is neither prime nor composite. Prime numbers are odd numbers, but not all odd numbers are prime. For instance, 3 is both a prime number and an odd number. However, 33 is an odd number but not a prime number.Learn more about Numbers