Question

Which of the following is not a perfect square?

• A. 169
• B. 196
• C. 144
• D. 245

Answer 1

The correct option is D

245

We know that, the numbers ending with 2, 3, 7, 8 are not perfect squares.

Here, the numbers end with 9, 6, 4 and 5.

$\text{We know that,}169={13}^{2}196={14}^{2}144={12}^2$

$\text{Also,}{15}^2=225\text{and}{16}^2=256\text{So, 245 is not a perfect square.}$