Which of the following is a perfect square?

The correct answer is Option (2) → 625

A number is a perfect square when it equals some whole number multiplied by itself. Compare each option with the squares nearest to it.

• 1057: \(32^{2}=1024\) and \(33^{2}=1089\), so 1057 lies between two squares and is not a square

• 625: \(25\times25=625\), a perfect square

• 7928: \(89^{2}=7921\) and \(90^{2}=8100\), so 7928 is not a square

• 64000: \(252^{2}=63504\) and \(253^{2}=64009\), so 64000 is not a square (it has an odd number of zeros at the end)