Mass is a measure of a bodies tendency to resist a change in motion, also known as inertia. So, I guess, in a way, the answer to your question is yes, kind of. The more matter a body consists of the more mass it will have. It would probably be best to separate the two terms in your mind and vocabulary tho...
mass
E (Energy) equals M (Mass) times C2 (speed of light square)
No. E=mc2 is a formula. Energy equals mass times the speed of light squared.
massM = mass
M stands for the mass.
m = e*c-2
There is no sum of e=mc2, it is an equation concerning matter and energy. e=mc2 stands for: Energy equals mass times the velocity of light squared. E = M C 2
zero mass = zero energy
Mass-energy equivalence
Some mass is "lost" during nuclear fusion and E = mc2 gives the amount of energy that this "lost" mass will be equal to.
e = mc2 is an equation, it has no size of its own. The value of e (energy) depends on the amount of mass (m) and conversely. The smaller the mass is the smaller the amount of energy.
Mass Energy.