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Find the least number which must be added to 1020 to obtain a perfect square?

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Find the least number which must be added to 1020 to obtain a perfect square?
1. 1
2. 2
3. 8
4. 4
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Correct Answer - Option 4 : 4

Calculation:

(31)2 < 1020 < (32)2

⇒ 1020 is not a perfect square.

To make a perfect square

 ⇒1020 + 4 = 1024

⇒ (32)2 = 1024

∴ To make 1020 a perfect square 4 to be added.

The correct option is 4 i.e. 4

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