The only note that can be a suspension is the fourth (which resolves downward by a 1/2 step to the third of the triad).
"2" chords are very popular in country and pop music. They are written as C2 or more usually C (add 2).
They are written this way to indicate that the second and third should be adjacent to each other (as opposed to a ninth where the second is on top).
So for a C2 I would play the root in the left hand and D,E and G in the right.