Find whether the following number is square of even number?

$289$

Find whether the following number is square of even number?

$1024$

Find whether the following number is square of even number?

$1521$

Find whether the following number is square of even number?

$7921$

Find whether the following number is square of even number?

$8464$

Find whether the following number is square of even number?

$61504$