I came across the following kismet node, can someone explain to me why a multiplication function takes 4 inputs/arguments? What does it do with C and D?
The node default is 2 inputs, It is possible to add pins.
(2 )* (2) = 4
(2) * (2) * (2) = 8
Veteran cred for calling it a kismet node 
Ohh ok, so its just “(A ) (B ) (C ) (D)…” ?
That is correct.