The following numbers are not perfect squares. Give reason. (I)1057             (ii)  23453      (iii)  7928   (iv)   222222

Explanation

To determine why the given numbers are not perfect squares, we can analyze the unit's place (the last digit) of each number. There is a property of perfect squares that states that the last digit of a perfect square can only be 0, 1, 4, 5, 6, or 9. If a number ends with 2, 3, 7, or 8, it cannot be a perfect square.

Let's examine each number step by step:

### Step-by-Step Solution:

1. **Check the last digit of 1057:**
- The last digit is 7.
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