Question

Which of the following numbers is not a perfect square?

• A. 225
• B. 256
• C. 289
• D. 302

Answer 1

The correct option is D 302

A number which is a perfect square always has 1, 4, 5, 6, 9 or 0 in its ones place.
Those numbers having 2,3,7 or 8 in its ones place are never perfect squares.
Hence, 302 is not a perfect square number.
225 =${15}^2$, a perfect square
256 = ${16}^2$, a perfect square
289 = ${17}^2$ , a perfect square