Question

find the least no. which must be added to 6543 to obtain a perfect square

Answer 1

this is solution of your question

Answer 2

find the square root of 6543 by long division method.
clearly 6543 is greater than number which comes in long division method.
next perfect square= 82square = 6724
to make theperfect square 6724-6543= 181
the required square number= √6724= 82.