For planar faces, any number you want of 4 of more.
examples:
Using a prism, the number of faces is the number of sides of the polygon of the ends plus 2. As any polygon can be used for the ends, the number of faces possible is any number 5 or more.
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Only one; a triangle is a 2D shape, not a 3D shape. Usually only 3D (or more) shapes are considered to have 'faces'.
it is a 3D shape and has 4 sides
3d shape Well actually it is a Cube
There is no such thing as a 3d triangle. A 3d shape which has only equilateral triangular faces can be a tetrahedron which has 4 faces or an icosahedron which has 20.
a sphere