# Write down separately the prime and composite numbers less than 20

Prime numbers are the numbers that have only two factors, that are, 1 and the number itself. However, most numbers have more than two factors, and they are called **composite numbers**.

## Answer: The prime numbers from 1 to 20 are 3, 5, 7, 11, 13, 17, and 19

## The composite numbers from 1 to 20 are 2, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, and 20

We will use the definition of prime numbers and composite numbers to answer this question.

**Explanation:**

A prime number is a number that has only two factors, 1 and the number itself.

A composite number is a number that has more than two factors.