how to find a square root of given number?using basic method
Since this is not my area of expertise, I searched Google under the key words "find square roots" to get this possible source:
http://www.homeschoolmath.net/teaching/square-root-algorithm.php
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.