WONDER #190: What Is a Prime Number?

Question 1 of 3

Which numbers between 1 and 10 are prime?

1. 1, 2, 3, 5
2. 2, 3, 5, 7
3. 1, 3, 5, 7
4. 3, 5, 7, 9

Question 2 of 3

What do you call numbers that are not prime?

1. odd numbers
2. even numbers
3. composite numbers
4. unique numbers

Question 3 of 3

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

1. Archimedes
2. Aristotle
3. Euclid
4. Newton

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