Quite possibly, the five Jem'Hadar could turn Data into a collection of four spasming limbs, one helpless torso, and one head that shouts insults at them like the Black Knight from the Monty Python sketch.
"Your Alpha was a Vorta, and the Founders smell of Tulaberries!"
That's the funniest thing I've read in a while. Permission to use it as my signature? With due credit to you, of course.
Demons of Air and Darkness seems to place Hirogen ahead in terms of raw strength, while Taran'atar (the Jem'hadar in question) seems to be superior when it comes to durability and tenacity.
One on one, Data could tear both apart before they had time to blink. En masse, they might be able to bring him down, like Timo said.