Prime and Composite Practice Topic Index | Grade 5 Math | Intermediate Test Prep | StudyZone

Prime numbers have exactly two factors.

Composite numbers have more than two factors.

The number 1 has only one factor so it is neither prime nor composite.

Let's Try Some!

Decide whether the numbers given are prime or composite. Click on your answer choice to check.

Remember to click on the "x" of the pop-up box to close it.

Is the number prime or composite?

16

prime composite

Let's do some more!

9 11 15 45

13 19 33 2

4 23 47 5

2 27 55 58

2 5 3 1

Back to the lesson?

Created by Sarah Therrien Updated by Carol A. Carroll Copyright © 2001-06 Oswego City School District