Sorry, I do not visit this forum much. The picture is too small to see any details, but judging by the general shape I would say it is some kind of Echinopsis.

Hi there, yes would totally agree, looks just like one of my Echinopsis plants...seems to be growing just as madly as mine!
I have always struggled to get it to flower though, just keeps producing offsets. All my other Echinopsis plants flower each year...oh well, I'll keep on trying.

If you want it to flower, Stop watering it in the fall and do not water until spring. Reduce the amount of water in summer and it won't pup as much, but now with so many pups, you have more to share ;-)