Can you replace the question mark with the correct number in the below table sequence?
A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:
There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?
With the help clues provided in the image, can you find the 5 digit key?
Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.
Hint: The grid reads the same across as down.
