A factor divides evenly into a given number.
A factor or divisor.
That's the definition of a factor.
A number that divides into a whole number evenly is called a "factor" of that number.
A number that divides evenly into another number is called a factor.
The smallest prime number that divides 147 evenly is three (3).
1 is the smallest number that divides any positive integer evenly.
It is called a 'factor'
it is a prime number