Prime and Composite Numbers Practice Test

Prime numbers have exactly two factors; composite numbers have more than two. For examples, 2, 3, 5, 7 are prime; 4 and 6 are composite. How many prime numbers are there between 10 and 20?

A prime has exactly two factors; a composite has more than two. Small examples: 2, 3, 5, 7 are prime; 4, 6 are composite. Select the prime numbers from the list: 22, 23, 24, 25.