Which of the following number is NOT a perfect square?

A perfect square is a number that can be written as $n^2$ for some integer $n$.

Check each number:

• $121 = 11^2$ ✅ perfect square

• $144 = 12^2$ ✅ perfect square

• $169 = 13^2$ ✅ perfect square

• $185$ ❌ not a perfect square

✅ Answer: 185