Both conversion factors are defined, so exact. Thus the answer will have only two sig figs since using counting rule - least number of sig figs. Has mass and occupies space. Mass is the property of matter resulting in its inertia and and attraction via gravity. Do not confuse mass and weight .
Weight is the force acting on an object due to gravity.
Matter has both physical properties and chemical properties. Physical properties of substances can be observed without, in principle, changing their compositions. Note that physical changes such as melting, cutting, etc.