525 is not a perfect square.
True
It is true, to get a square root of a number, first of all we need to write its prime factors. Then, we need to combine these prime factors and write them in the an exponent form to get the final result.
In case of 525 we get, 525 = 25 × 21.
25 is a perfect square of 5, but 21 is not a perfect square. So, this shows that, 525 is not a perfect square.