What can be the possible units digit of the square root of the square number 32x489, where x is a positive integer?

We know that if the unit's digit of a square number is 9, then the unit's digit of its square root is either 3 or 7.

3 × 3 = 9

7 × 7 = 49

Thus, the possible units digit of the square root of the square number 32x489 is 3 or 7.