Which of the following could be a perfect square?

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Question

Which of the following could be a perfect square?

Options:

A . 1681

B . 23453

C . 222222

D . 1057

Answer: Option A
:
A
Perfect squares cannot have 2, 3, 7 or 8in their unit's place.
In the given options only 1681 does not endwith a number other than these.
The perfect squares of numbers ending in 1 and 9 have 1 at their unit's place.
Thus, 1681 could be a perfect square of an integer ending with either 1 or 9.

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