rectangular numbers are numbers just displayed in the shape of a rectangle
e.g take the number 6 it can be shown as:
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Well, honey, none of the numbers between 3 and 11 are rectangular. Rectangular numbers are the product of two consecutive integers, like 6 (2x3) or 12 (3x4). So, in this case, you're out of luck if you're looking for rectangular numbers between 3 and 11.
Rectangular numbers are of the form n(n+1) for n = 1, 2, 3, 4, 5, 6, ... The first few rectangular numbers are: 2, 6, 12, 20, 30, 42, ...
57
The question is ambiguous since a rectangular pyramid and a rectangular prism will have different numbers of flat surfaces. There is no indication in the question which shape is intended.
It is a matrix or a determinant.