## Definition:

A number with only two factors, 1 and itself, is a prime number.

## Prime Number

Let's say that we have the number 3. How do we know that 3 is a prime number?

Well, it is pretty simple: just list the factors of the number.

Factors of 3:

3: 1 and 3.

From what we said earlier, a prime number only has two factors, 1 and itself. So, that means that 3 is a prime number!

*Sheet 1 What are Prime Numbers*

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