it is a Prime number
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A factor divides evenly into a given number.
19/40 is in the reduced form as there is no whole number that divides 19 and 40 evenly (remainder zero).
The smallest prime number that divides 147 evenly is three (3).
The smallest prime number that divides 98 evenly is 2.
1 is the smallest number that divides any positive integer evenly.