How many even integers from 1 to 100 (both inclusive) have EVEN number of factors?  Pick one:
A) 13 B) 14 C) 5 D) 6 E) 7
Integers having even number of factors will be perfect squares. even numbers will have even perfect squares. Thus, the possible values for the perfect squares are :   4,16,36,64,100 and the corresponding integers are 2,4,6,8,10(more than 4). Thus 5 is the correct answer .
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How many even integers from 1 to 100 (both inclusive) have EVEN number of factors?