9 isn't prime, but one three-digit multiple of 18 is 108.
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101 is the first three-digit prime number.
It is 103 which is a prime number because it has only two factors which are itself and one
997 is the last 3 digit prime number
There are 17 such numbers.
smallest 3-digit prime is 101. 100 is not a prime number (very obviously)