Question

Which integer is not a perfect square A.100 B.289 C.169 D.186

Answer 1

If an integer is a perfect square, then the square root of that integer is an integer.

$\begin{gathered} \sqrt[]{100}=10 \\ \sqrt[]{289}=17 \\ \sqrt[]{169}=13 \\ \sqrt[]{186}\approx13.64 \end{gathered}$

Then, 186 is not a perfect square.