Write five numbers for which you cannot decide whether they are s… - Vidyadip

Question

Write five numbers for which you cannot decide whether they are squares.

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Answer

A number whose unit digit is $2, 3, 7$ or $8$ cannot be a perfect square.
On the other hand, a number whose unit digit is $1, 4, 5, 6, 9$ or $0$ might be a perfect square (although we will have to verify whether it is a perfect square or not).
Applying the above two conditions,
we cannot quickly decide whether the following numbers are squares of any numbers, $1111, 1444, 1555, 1666, 1999$

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