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Is 1 a Prime Number?

Is 1 Prime?

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Is 1 a Prime Number?. Prime Numbers - Is one a prime number? A Free Printable poster that explains why 1 is NOT prime. Or is it?

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Is 1 a Prime Number?

Is One Prime?

No! One is NOT a prime number!

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

'For a number to be prime it must have TWO distinct (different) factors'. Ham up the word TWO. Use a funny voice.

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. Ham up the word AND. Use a funny voice.

In the case of 1 'itself ' IS one.

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

Is One Prime?

What is a Prime Number?

Here is a simple test you can do to work out if a number is prime. e.g. Is 11 prime? Is 21 prime? etc

Use blocks to see if the poster below helps your students identify prime numbers.

What is a Prime Number

You might also like to have a look at...

- What is a prime number?
- Is two a prime number?
- a list of prime numbers



The technical reason what 1 is not prime

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Prime Number Posters - Is one a prime number? A simple test to see if a number is prime.

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