According to question,

In order to find the square root of the given number we will use the long division method.

Hence,

Using long division method,

Therefore, to get a perfect square than the given number we have to take the square of the next natural number of the quotient, i.e. 78

792 = 6241

Therefore,

Number that should be added to the given number to make it a perfect square = 6241 – 6203

= 38

Thus, the perfect square obtained is 6241 and its square root is 79