All integers that are not perfect squares.
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It's a prime number. Therefore the only rectangular array it has is 1*73 (or 73*1)
13...13x1.
A rectangular prism is the only shape that is made up from only rectangular faces. But there are countless shapes which contain rectangular faces along with other shapes.
A rectangular prism or cuboid.
There are many shapes that have one and only one rectangular face, but an example of one would be a rectangular pyramid.