So I looked up your questions and these are the answers I got: Do rainbows carry any heat/warmth?

I don't know because all it said was how rainbows form. Not if they carried heat or not.

Is it possible to stand at the end of the rainbow and know that you are there?

There is no definitive answer to whether it is possible to stand at the end of a rainbow and know that you are there. (Thanks Google ;) )

Can rainbows span a whole country? I don't know. All I know is that there is a country called "Rainbow Country" in Ontario, Canada!

Do they have any physical matter or strengths that can alter the air or moisture around it? The rainbow without rain is possible! I am trying to keep this short.

What is the most amount of rainbows you've seen in one place??? Three!

Ta da! Keep up the good work @danaidhbee