The answer is no. A square pyramid can not have all triangle faces because the base of this particular pyramid would be a square.
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The base will be a square, all the rest of the faces are triangles.
No. I has 3 triangle faces and one square face.
A rectangular pyramid, or a square pyramid, has 5 faces in all.
Triangular based pyramid
If the base of the pyramid is a triangle then all its faces would be triangular in shape.