Maybe. But EMF isn't dangerous. If it were, my remains would have been toasted during my last MRI. Or perhaps I'd glow in the dark. Hey, that would be cool!!!!
Any electric motor with a high amperage draw will create a significant EMF. I'm reasonably sure that these cars have shielding in place to cut down on the amount that makes it out to other parts of the car, but I have to imagine that the EMF produced in a hybrid vehicle is significant. If you are asking that question in relation to health issues... well, I would challenge you to find any conclusive study that says EMF (especially at the levels produced by a hybrid) poses a significant health risk.
While searching the terms "hybrid car EMI" I ran across this website: http://www...brids.html
Some interesting reading and actual values reported therein. I looked over a number of other sites that came up in the search and found quite a bit of information. If you're interested, I suggest doing the same.
The upshot is that the Prius is no different from any other car. You can get much higher EMF exposure from many household appliances and electronics than you do from your car. Even if you are worried about EMFs, your car (including your hybrid) should be low on your list of worries.