What is the perfect square of 48?
The square of
The word "perfect" is this question is not needed.
A perfect square is the square of a whole number. So the square of
For example: 9 is the square of 3, we say "9 is a perfect square" ("it is the square of 3"). We do not need to say (and so we don't) that "9 is the perfect square of 3".
There is no such thing as "the imperfect square of a number"