For each of the following, find the least number that must be added so that the resulting number is a perfect square.

55078

Using division method:

Clearly, 55078 is greater than 235².

∴ On adding the required number to 55078, we shall be getting 235² i.e, 55225.

So, the required number = 55225 - 55078 = 147.

Hence, 147 should be added to 55078.