The statement "The square root of the largest perfect square stays inside of/underneath the radical" is False because taking the square root of a perfect square essentially removes the radical sign.
If you have a radical expression such as \( \sqrt{N} \), where \( N \) is a perfect square (like 16, which is \( 4^2 \)), taking the square root gives you \( \sqrt{16} = 4 \), thus removing the radical.
Therefore, the perfect square does not stay "inside of/underneath the radical" after the square root is taken.