Just by looking at the numbers, identify which of the following can not be

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Question

Just by looking at the numbers, identify which of the following can not be a perfect square.

Options:

A . 382

B . 484

C . 576

D . 529

Answer: Option A
:
A
Numbers ending with 2, 3, 7, or 8 at unit's place are never perfect squares.
Estimation without actually finding roots:
484 can be the perfect square of a number ending with 2 or 8.
576 can be the perfect square of a number ending with 4 or 6.
529 can be the perfect square of a number ending with 3 or 7.

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