155376

1. 960 soldiers can be arranged in a hollow square ten different ways- Because there are ten different factor pairs for 960. If you use Alison's method and put a factor pair for 960 in each 'arm', multiply them and add them together, that is the answer.
2. The non symmetric hollow squares can be of any number then, since it does not follow a particular rule.
3. Find the factors pairs of that number, then arrange them as told, like with number 1.
4. As said in the second answer, non symmetric hollow square can be any number then.