Question

Which of the following number is not a perfect square?
(a) $1156$
(b) $4787$
​​​​​​​(c) $2704$
​​​​​​​(d) $3969$

Answer 1

Now, we know that numbers which end with $2,3,7$ or $8$ can never be a perfect square.

Hence, out of the given options. one $4787$ ends with $7$ and hence it is not a perfect square.