Express $64$ as the sum of  $8$ odd numbers.

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:

$20121208$