This question was previously asked in

Official Soldier Technical Paper: [Trichy (CHE)] - 27 Dec 2020

- 45
- 30
- 25
- 36

Option 1 : 45

As we know that

631 > 625 = 25^{2}

& 631 < 676 = 26^{2}

⇒ 25^{2} < 631 < 26^{2}

⇒ Number should be added to make 631 a square number = (676 - 631) = **45**

**∴ 45 should be added to 631 to make it a perfect square number.**

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