It's a single 4 ohm.
Basically it has one voice coil, and the base impedance level of that coil is 4 ohm's.
The amp you have listed puts out 200 rms @ 4 ohm. So yes it will drive the sub, just not quite to it's full potential.
The reason why Acarmody reccomended the other sub above, was because of it's dual voice coil arrangement. Multiple coils allow you to wire them together to drop the impedance levels. It's difficult to find a mono block amplifier that produces decent power levels at 4 ohm, because they are all designed to run lower than that. Using any mono amp at a 4 ohm load is just limiting the amps potential.
End of the day you have to spend more on the amp than what you did on the sub, and it still dosen't perform at it's best. You should have taken the advice on board that was given to you in the above posts.
Did you buy the sub new, can you refund it or swap it? You don't have to spend any more than your combined budget, just picking the right components that will work well together is all.