Definition. A prime is a number that is divisible by itself and 1 without a remainder. In other words, it has only two divisors.

For example, number 5 is divisible by itself and one without a remainder:

5 : 1 = 5

5 : 5 = 1

So the number 5 is a prime number.

Definition. A composite number is a number that has two or more divisors.

For example, number 4 is a composite number because it has two or more divisors: 4, 2, and 1.

4 : 4 = 1

4 : 2 = 2

4 : 1 = 4

So the number 4 is a composite number.

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