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Six rectangles. Three pairs of congruent rectangles. Imagine a standard box unfolded. The two ends are the same, the sides are the same and the top and bottom are the same.
It is called a cuboid.
It is simply called a pentagonal prism. That is a prism based on the 2D shape known as a pentagon.
It could be called a square prism but a more common name would be a cuboid.
A rectangular prism with 6 congruent faces is called a cube.