Question

Question 2 (v)

The following number is obviously not a perfect square. Give reasons.

64000

Answer 1

The square of any number generally has one of these digits 0, 1, 4, 5, 6 or 9 at its unit place.
Also, a number which is a perfect square may have even number of zeroes at its end.

64000 have three zeros at the end of it. However, a perfect square cannot end with an odd number of zeroes, it is not a perfect square.