unable to use amazon app

What Amazon app is it exactly? Amazon makes several Apps. Store, Prime, Kindle, Music etc...

As mentioned what happens when you try to use it or delete it? Do you get an error? If so, what does it say exactly?

What exactly happens when you try deleting the Amazon app on your iPhone? Which exact model is your iPhone and what version of iOS is it currently running? Do you have any issues with other Apple or non-Apple apps on this phone?