The following numbers are obviously not perfect squares. Give reason.(i) 1057 (ii) 23453 (iii) 7928 (iv) 222222 (v) 64000 (vi) 89722 (vii) 222000 (viii) 505050

We know that, numbers having 2, 3, 7 or 8 at units place are not perfect squares.
That is because:
1²=1
2²=4
3²=9
4²=16
5²=25
6²=36
7²=49
8²=64
9²=81
Also,
10²=100
100²=10000
Hence, any perfect square will end with 1, 4, 5, 6, 9 or even number of zeros.
All the given numbers end with either 2, 3, 7, 8 or with odd number of zeros.
Hence, the given numbers are not perfect squares.