Which chain should I use for Rex Touring with 5 gears?
To directly answer your question, no, any chain which is long enough is not compatible with your bike. No one here can tell you what chain will fit without a lot more detail in your question, but this is a good place to start. Daniel posted that link as a comment on my earlier answer.

Ask your LBS. They will know once they see the bike. Or measure the width of the outside chain plates with a vernier caliper on the old chain.