As a product of its prime factors: 2*2*5*5 = 100
6
The prime factorization of 100 is 2x2x5x5. There are no pairs of prime factorization with a difference of two in the number 100.
Eight pairs.
7
One pair.
100
There is only one even prime number and it is 2
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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.
The 15 twin prime numbers between 1 and 100 are in 8 pairs. The twin prime pairs are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
3,5 5,7 11,13 17,19 29,31 41,43 59,61 71,73
101,103 107,109 137,139 149,151 179,181 191,193 197,199