for the prime number HW

Hi, I am currently working on a homework assignment and on my last problem but I am having some trouble.

The question is: For the prime number: ((((Why the for loop ends on sqrt(n) and not on (n)?)))) You need to explain your answer in the class ,,You should have a full explanation.

Answer 1

[Roger Stafford]

Same answer as in

http://www.mathworks.com/matlabcentral/answers/270893