word problems questions

Question

An army contingent has 9820 men in total. They are required to stand for inspection in equal number of rows and columns. Find the number of man in each row and columns. How many man are left out ?

Answer 1

There is one row and one column, so $9819$ men are left out.

Answer 2

The largest square which is less than $9820$ is $99^2=9801$, so there are 19 men left out.