Greatest or least five digits no: which is a perfect square

Find the greatest number of five digits which is a perfect square.

Find the greatest number of five digits which is a perfect square. Also find the square root of the number of obtained.

The least 4 digit number which is a perfect square is

Find the greatest five digit number which is a perfect square.

Find the greatest number of six digits which is a perfect square.

Find the greatest number of six digits which is a perfect square.

Find the greatest number of five digits which is perfect square. What is the square root of this number ?