There are actually 6 that have been released and one that is due out in 2008. They are: University, Nightlife, Open for business, Pets, Seasons, Bon Voyage and Freetime (due for release in late February 2008).
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If you are talking about installing a Sims 2 expansion to the Sims 1, it is impossible. You can only install the Sims 2 expansion packs into the Sims 2, not The Sims 1 or 3.
There are no mermaids in any of the Sims games or expansion packs.
Yes you have to have the actual game for the expansion packs to work.
No, sorry, the only expansion packs for the Sims 2 on PS2 is Sims 2 Castaway and Sims 2 Pets.
Yes you can. I have the Sims 2 Double Delux myself and I have all of the expansion packs installed and working on my PC.