Just for Fun: Problem 3

It's 6am and thirty lockers stand in a long lovely row, closed and neat, ready for the opening of another school day.

• The first student arrives and, what the heck, opens every locker! 
• The second student arrives and changes the position of every second locker (i.e. lockers 2, 4, 6, 8, etc all got closed).
• The third student arrives and changes the position of every third locker (from open to closed or vise versa)
• The fourth student changes the position of every fourth locker...
• This continues until the 30th student arrives and changes the position of locker #30.

What is the final configuration of the lockers after all 30 students have passed by?