Question

least number which can be subtracted from 4639 so that the difference is a perfect square​

Answer 1

Answer:

least number is 15 which can be subtracted.

Answer 2

Answer:

Hit and try is best method

It is 4 digit number so square root will have of 2 digits . By 46 you can see tenth digit will be

6 ( 36 < 46 < 49 ).

And there you go try first digits until it exceeds 4639

You will get 68^2 = 4624

So 4639 - 4624 = 15