# WONDER #190: What Is a Prime Number?

Question **1** of **3**

## Which numbers between 1 and 10 are prime?

- 1, 2, 3, 5
- 2, 3, 5, 7
- 1, 3, 5, 7
- 3, 5, 7, 9

Question **2** of **3**

## What do you call numbers that are not prime?

- odd numbers
- even numbers
- composite numbers
- unique numbers

Question **3** of **3**

## Which mathematician proved that an infinite number of prime numbers exists?

- Archimedes
- Aristotle
- Euclid
- Newton

Check your answers online at https://wonderopolis.org/wonder/what-is-a-prime-number.