BACK TO WORKSHEETS
A prime number is one that has exactly two factors, itself and 1.
A composite number is one that has more than two factors.
Prime numbers include 2, 3, 5, 7, 11, 13, 17 etc.....
Composite numbers include 4, 6, 8, 9, 10, 12, 14, 15 etc....
The only even number that is prime is the number 2. All other even numbers will have the number 2 as a factor, so they can't be prime.
The number 1 is not a prime number because it has only one factor - 1!
In this activity, we will be deciding whether a number is prime or composite.
Are you ready to begin?
