No. they just said that their tokens have been approved for listing by a few exchanges which is going to happen after ico end, So it's not listed on any exchange yet, the only way to get it right now is through their website.
After all, this is happening with every currency. I do not understand these questions at all when they appear on the stock exchanges. Maybe sometimes it is possible to buy coins outside the official exchange from someone who bought them officially. Let's wait calmly and see what value it will achieve.
Yes it's possible, but I do not recommend anyone to buy any token from someone who bought them officially, because if something goes wrong with project during tokensale you will not able to get refund and that's why we should only from official website ( smart contract ). that applies on P2PS token of course.