In this problem we are given a 5-by-5 matrix and calculating its deter-
minant by hand is tedious. We look at a similar problem, but with smallerdimension. First, we look at examples involving 2-by-2 matrices to see if this
case holds: if we are given two two-digit integers (say, x = a1a2 and y = b1b2)
and if these integers are divisible by a given integer k, is it true that k also
divides the determinant of the matrix