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(D) To find the least number to be added to $1020$ to make it a perfect square,we first find the square root of $1020$ by long division method.$31^2 =

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$4$

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(D) To find the least number to be added to $1020$ to make it a perfect square,we first find the square root of $1020$ by long division method.$31^2 = 961$ and $32^2 = 1024$.Since $1020$ lies between $31^2$ and $32^2$,the next perfect square is $32^2 = 1024$.The number to be added is $1024 - 1020 = 4$.

What is the least number that can be added to the number $1020$ to make it a perfect square?

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