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

$64000$

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

$52922$

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

$333000$

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

$202020$

What will be the unit digit of the square of the following number?

$71$

What will be the unit digit of the square of the following number?

$192$

What will be the unit digit of the square of the following number?

$899$

What will be the unit digit of the square of the following number?

$4583$

What will be the unit digit of the square of the following number?

$4314$