What is that fraction which when multiplied by itself gives 227.798649?

Find the square root of the following numbers in decimal form:

9998.0001

Find the square root of the following numbers in decimal form:

0.00038809

The area of a square playground is 256.6404 square meter. Find the length of one side of the playground.

What is the fraction which when multiplied by it self gives 0.00053361?