Determine whether the squares of the following numbers are odd or even : $30018$

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

$8204$

$19$ and $20$

Find the square of the following number without actual multiplication. 

$65$

Find the square of the following number without actual multiplication. 

$95$

Find the square of the following number without actual multiplication. 

$205$

Write a Pythagorean triplet whose smallest number is $8$.

Write the Pythagorean triplet whose one member is $12$?