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KS3

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Question

Is 1 a prime number?

2 years ago

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2 Answers

Richard A Profile Picture
Richard A Verified Sherpa Tutor βœ“

Primary Teacher with 15 years teaching experience. 11+ tuition.

A prime number is a positive whole number that is only divisible by 1 and itself. The number 1 is divisible by 1, and it’s divisible by itself. Therefore it is not prime!

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Shamim H Profile Picture
Shamim H Verified Sherpa Tutor βœ“

Experienced Maths Teacher (16 yrs) & Examiner for 2 Major Exam Boards

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A positive number that is divisible by itself and 1 is called a prime number.

1 is divisible by itself and 1 and this is where it can get confusing.


I prefer to tell my students 'A prime number is positive number that is divisible by itself and 1 meaning it MUST have only TWO factors'. When you say this fact it is clear 1 is NOT a prime number as it only has 1 factor, i.e 1.

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