Is 1 a Prime Number?
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!
'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.