What could be the possible ‘one’s’ digits of the square root of each of the following numbers?

**(i)** 9801

**(ii)** 99856

**(iii)** 998001

**(iv)** 657666025

The possible ‘one’s’ digits of the square root of the numbers :

**(i)** 9801 is 1 or 9

**(ii)** 99856 is 4 or 6

**(iii)** 998001 is 1 or 9

**(iv)** 657666025 is 5