Practice: Prime Number – Math Fun for Kids

Prime Number

Decide if a number is prime (only 1 and itself as factors).

★ Choose Your Level:

Easy

(1-10)

Medium

(1-50)

Hard

(1-100)

Expert

(10-500)

☰ How Many Problems?

Quick

Normal

Challenge

Marathon

Did you know?

2 is the only even prime number.

Prime numbers have been studied for over 2,000 years.

There is no largest prime—they go on forever!

Understand Prime Number before you start

Read this if you're new to the topic—it will help you know what to do in each problem.

A prime number has exactly two factors: 1 and itself. So 5 is prime because only 1 and 5 divide it evenly.

Numbers like 4, 6, 8, 9 are not prime because they have more than two factors. 2 is the smallest and only even prime number.

Examples

5 is prime

9 is not prime (3 × 3 = 9)