It is impossible to tell. You need to know a rectangular WHAT? A rectangular prism, a rectangular pyramid, a rectangular dipyramid, etc will all give different answers.
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Yes, there are two pairs of parallel sides.
A cylinder is different because it is has no edges and a rectangular prism does. A cylinder has two faces and a rectangular prism has 6. A cylinder doesn't have any verticies and a rectangular prism has 8.
A pentagonal prism has two end faces of pentagons plus 5 rectangular faces between them; thus it has: 7 faces, 10 vertices and 15 edges.
I don't think there's a three dimensional rectangle, and if the two dimensional triangle exists in three dimensional space, it would have strange properties because it only has 4 edges. There however, a three dimensional rectangular prism. It has 12 edges.