How many numbers lie between square of $85$ and $86$?

Find the unit’s digit of the square of the following number .

$29$

Find the unit’s digit of the square of the following number:

$132$

Find the unit’s digit of the square of the following number

$64293$

Find the unit’s digit of the square of the following number

$236601$

Find the unit’s digit of the square of $929209$.

Find the unit’s digit of the square of the following number:

$20121208$

Find out if $33333$ is not a perfect square.

Is $26623$ a perfect square?