How many wires are there in the cable? Single phase will have live, neutral and earth, three phase will have three lives, L1,L2 and L3, a earth and although it probably doesn't need it, maybe a neutral.

However, and please don't take this the wrong way, I am not putting you down, just thinking of yours and your families safety, but if you don't know the difference between a single phase and three phase, should you be doing it? Also have a look at the data plate on the motor, it will say on it weather it's single or three phase.
Also even if it is three phase, maybe it will be a dual voltage three phase motor, and then you can use a vfd on it, but that will be a lot more complex to wire and set up than putting a plug on!

I really am saying this to help.

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