Find the smallest number by which 252 can be multiplied to obtain a perfect square

A.
2 
B.
3 
C.
5 
D.
7
Correct Answer: Option D
Explanation
(252 = 2^{2} times 3^{2} times 7)
(therefore) To make 252 a perfect square, the smalest number to multiply with = 7.
(252 times 7 = 1764 = 42^{2})