The number is not perfect square. Give reasons?

$257$

The number is not a perfect square. Give reasons?

$4592$

The following number is not perfect square. Give reasons?

$2433$

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

$5050$

The following number is not perfect square. Give reasons?

$6098$

Find whether the square of the following number are even or odd?

$431$

Find whether the square of the following number are even or odd?

$2826$

Find whether the square of the following number are even or odd?

$8204$

Find whether the square of the following number are even or odd?

$17779$