Answer :

(i) 9801

Unit digit = 1


Unit digit of square root = 1 or 9


As number is odd, square root is also odd


(ii) 99856


Unit digit = 6


Unit digit of square root = 4 or 6


As number is even, square root is also even


(iii) 998001


Unit digit = 1


Unit digit of square root = 1 or 9


As number is odd, square root is also odd


(iv) 657666025


Unit digit = 5


Unit digit of square root = 5


As number is odd, square root is also odd


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