Including 1 and 100: 75 (73 if the range does not include 1 and 100.)
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
1, which is 2 b/c all of the other even numbers are divisible by 2, therefore making it composite.
The only even prime number (not only from 1 to 100, but in general) is 2. All other even numbers are multiples of 2, and therefore, by definition, not prime numbers.
1 is special2 prime3 prime4 composite5 prime6 composite7 prime8 composite9 composite10 composite11 prime12 compositeext.