### Welcome to the Maths Resources of Adrian Bruce

### Is 1 a Prime Number?

Category: Prime Numbers

# Is One a Prime Number? No!!!

*Summary:** Many people hold the misconception that one is a prime number. This mathematics poster explains it all.*

**One is Not Prime!**

I usually try to introduce the concept of 1 not being prime by examining the mathematical definition closely.

**'For a number to be prime it must have TWO distinct (different) factors'.**

In 1's case its factors are 1 and 1.

**For a number to be prime it must be able to be divided by itself AND 1.**

In the case of 1 'itself ' **IS** one.

This poster can then be added to your Math Vocabulary Display as a form Maths Help reference material :)

**Is 1 a Prime Number?**

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**Is 1 a Prime Number?**

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