A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
square
a square
No. A square is a 2-dimensional figure. A cube is a 3-dimensional figure whose faces are all squares.
A cube.
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
A square dice would fit the given description.
A solid figure with eight vertices and all faces of equal size is called a cube. Each face of a cube is a square, and a cube has 8 vertices and 6 faces.
a square pyramid
CUBE
cube!!
A cube.