Find the square root of the following number by the prime factorisation method:

$28900$

By which the least number should we multiply the following to make perfect square?

$700$

By which the least number should we multiply the following to make perfect square?

$6912$

By which the least number should we multiply the following to make perfect square?

$117600$

By which the least number should we multiply the following to make perfect square?

$780$

Find the smallest number by which $252$ must be multiplied to get a perfect square. Also, find the square root of the perfect square so obtained.

Find the smallest number by which $396$ must be multiplied so that the product becomes a perfect square. 

Find the least number that is a perfect square and divisible by each number $8, 9\text{ and} 10$.