Without doing any calculation, find the numbers which are surely not perfect squares.

The perfect squares of a number may end with any of the following digit satun it's place:

0,1,4,5,6,or 9

And, a perfect square will end with even number of zeroes

(i) Since the unitplac edig it of number 153 is 3,hence it is not a perfect square

(ii) Since the unit place digit of number 257 is 7, hence it is not aperfect square

(iii)Since the number 408 has its unit place digit as 8, it is not a perfect square

(iv)Since the number 441 has its unit place digit as 1, it is a perfect square