Factors GMAT, GRE Problem

How many integers less than 200 will have only 3 factors?


A. 2
B. 4
C. 6
D. 9
E. 12





Only the square of the prime has 3 factors

2^2 = 4
3^2= 9
5^2 = 25
7^2 =49
11^2 =121
13^2 =169

There are 6 integers below 200


C