102
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1 is the only number between 1 and 100 that has too few factors to be a prime number.
There is no last prime number: they go on for ever. The first prime larger than 100 is 101.
The first prime number that is less than 100 would be "97".
100 is composite, because it has more than 2 factors.
It is 97 which has only two factors because it is a prime number