Farm Tractors

We recently bought a small 25 acre farm. The terrain is mostly flat with no major issues like rocks or dangerous slopes. The guy that I called about shredding the land wants $600 to do it one time. That price prompted us to think about buying our own tractor instead.

I found a used, 2-year-old Yanmar 2500, 2 x 4, 3 cylinder deisel tractor. It comes with a 5 foot shredder and also a front end loader. He wants $8000. He wants to upgrade to a 4 X 4.

My question is: Is this tractor big enough to handle our 25 acres? Or should I look for a 4 X 4? What does 2 X 4 and 4 X 4 mean?