large digital multiplier IC
A few companies made stand alone digital multipliers.  A long time ago I used one from Weitek (might be spelled differently).  If I remember there were two other competing products we considered at the time.  One was from Honeywell, but I'm not sure that ever made it to the market.  I think the third was Analog Devices.

I designed a 3D graphics processor in the mid to early 1980s that used a floating point multiplier and adder.  These were both large DIP chips.  Both had effectively a 5 stage pipeline if I remember right.  I put a very basic sequential controller around them so we could do things like divide, square root, sin, cos, etc by using microcode.