1) Is Z/nZ the set of integers modulo n, Zn? For ex, is Z/4Z {0,1,2,3}

2) What is Fp? The field Zp?

EDIT: Never mind. Looked up Z/nZ- out of my leaque. I can only add the trivial observation that if you can populate each position of a 2x2 matrix with any of q elements, the number of different matrices is q^4.