Show that the given number is a perfect square. Also, find the number whose square is the given number. 

$14641$

Show that the given number is a perfect square. Also, find the number whose square is the given number.

$4761$

Find the smallest number by which the given number must be multiplied so that the product is a perfect square: 

$23805$

Find the smallest number by which the given number must be multiplied so that the product is a perfect square: 

$12150$

Find the smallest number by which the given number must be multiplied so that the product is a perfect square: 

$7688$

Find the smallest number by which the given number must be divided so that the resulting number is a perfect square: 

$14283$

Find the smallest number by which the given number must be divided so that the resulting number is a perfect square:

 $1800$

Find the smallest number by which the given number must be divided so that the resulting number is a perfect square: 

$2904$

Which of the following numbers are perfect squares?

$11,12,16,32,36,50,64,79,81,111,121$