1, 73
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Any prime number can be divided evenly only by itself and "1". The only numbers that divides into 73 evenly are 73 and 1, so 73 is a prime number.
A prime number is a number with the factors one and itself. 73 is a prime number because it only has two factors: 1 and 73.
A factor divides evenly into a given number.
The smallest prime number that divides 147 evenly is three (3).
The smallest prime number that divides 98 evenly is 2.