Solipsism is recognizing that you can't prove, or even determine, whether anything outside of your thoughts exists. So solipsism is a fact. But I guess you are asking whether it's possible that the world as you perceive it doesn't exist.
The answer is that it's not only possible, a logical case can be made that it's likely.
For example, the Simulation Argument goes like this:
It's pretty clear that computers will eventually be so powerful that even a normal household pc can simulate a whole person's life so well that someone inside the simulation can't tell it's not real. If that happens, and becomes common, there will quickly end up being more simulates people than real people, so the odds will be that any given person is a simulation. And there's no reason to think that hasn't already happened, and you're inside such a simulation.
On the other hand, I have some good news:
You're definitely not the only real person, because I know I (or at least my thoughts and perceptions) exist.
So now you can let me know if you are real, and we'll be set.
Well except that's exactly what a fake person would say. So we're screwed.
Or at least I am.
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