Being a Prime number, 19 only has 2 factors: 1 & 19.
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Nine has three factors.
The factors of 81 are 1, 3, 9, 27, and 81
The factors of 13 are: 1, 13 The factors of 19 are: 1, 19
The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
All of the positive-integer factors of 16 are: 1, 2, 4, 8, and 16.