Question

which is a not perfect square?
64 36
10 49

Explanation:

Step1: Identify perfect squares

A perfect square is an integer that is the square of another integer.

• $8^2 = 64$, so 64 is a perfect square.
• $6^2 = 36$, so 36 is a perfect square.
• $7^2 = 49$, so 49 is a perfect square.

Step2: Check non-square number

There is no integer $n$ such that $n^2 = 10$, since $3^2=9$ and $4^2=16$, with 10 lying between them.

Answer:

10