I would call a vet...
If your hamster is not breathing, I suspect that he has passed away.
Save the hamster food
Get a new one
its sleeping....
If it is like that, cold and not breathing, yes, it is dead.
it means that it is dieing
It may be excited. Most small animals breath rapidly when they are being held or if you are reaching out for them. It's not bad or contagious but if your hamster is breathing unevenly, bring it to the vet immediately!
dying
Lungs it's a mammal like us
A person can save a dying hamster by taking it to a vet for small animals. They may be able to fix the issue at hand.
Well first, if its not breathing thats a good sign. Second, if there is no air where the hamster is placed, thats also a good sign.
its got asthma