Yes, the Great Pyramid of Giza is a square pyramid. From a birds eye view, you could see that the bottom is in the shape of a square.
See: http://www.mathsisfun.com/geometry/pyramids.html
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It depends. A pyramid is a basic shape if you are reffering to the pyramids like the ones in Giza, Egypt those would be a square-based pyramid.
A pyramid like in Egypt or something like that. Or a triangular tent
Egypt
A pyramid with 5 sides is a PYRAMID. First side is the SQUARE base, which you probably don't think about. Sides 2,3,4 & 5 are the four triangular faces. The pyramids of ancient Egypt are of this form. There is NO such thing as a pyramide of four sides. That is a Tetrahedron.
A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.