Question

what least number should be 9991 added to make the following a perfect square.​

Answer 1

9 should be 9991 added to make the following a perfect square

the square root of 9991 is 99.954

so the nearest square to 9991 is 100×100

=10000

so the 9 should be added to 9991 to make it perfect square

Answer 2

Answer:

9 should be added to 9991 to become 10000 and to become a perfect square of 100

because 100×100=10000