Maxperson
Morkus from Orkus
I am not sure that's really accurate, given how many people within their area of influence are attempting to flee.
If that number isn't 100%, and it's far from that, then they have a permanent population.
This seems highly debatable, on several levels. First, let us start with how they've declared their own statehood several different times, with different parameters, the most recent of which, technically, encompasses the entire planet. Making aggrandized and nonsensical claims like that weakens their claim on statehood, as it interferes with their ability to enter into relations with other states.
What they want doesn't matter. What matters are the borders they control, which are measurable.
Be that as it may, the Islamic State of Iraq and the Levant (ISIL) was declared a bit less than a year ago, and its borders have been in flux since that time, since they are actively at war, and battles that move their borders are on the order of 100 casualties (meaning, small). It is new and ever changing - that doesn't sound like well-defined territorial boundaries to me.
War doesn't stop statehood. If it did, then every time we had a house secede from the U.S., the U.S. would cease to be a state.
I question this as a requirement, insofar as it can be met by merely saying, "We have a government!" Any definition that can be met by 5-year-olds in a tree house probably isn't a solid definition.
ISIS is actually governing, building infrastructure and more. That can't be said by the children you describe. If ISIS isn't a government for doing what real governments do, then there are no governments in the world.
Can it, really? Name one other state with which is has formal relations - ambassadors and treaties. I don't think being sent a several million dollars by the Saudis in ways that allow the Saudis plausible deniability count as "relations". Nor do trade arrangements that would be called "smuggling" by the states through which goods pass - bribing border guards does not count as having "relations".
It doesn't matter if other states are receptive, or even if ISIS never attempts to form relations. It is capable of it, and that's what matters.