1175

It is but most people will specify burger when talking about a burger and leave sandwich for something like a deli sandwich.

thought you were right, so googled that and he said:

"So technically, yes, a hamburger is a sandwich, a very particular kind of sandwich. It has a lot of things unlike most sandwiches (a hot, grilled layer; a bun rather than sliced bread). ..."
https://english.stackexchange.com/questions/246580/is-a-hamburger-considered-a-sandwich

but if i keep on reading:

"Key Difference: A sandwich is cooked by generally placing a filling of meat or vegetables between two bread slices (flat bread) while a burger is cooked by placing a filling of meat or vegetables between a bun, sliced into two."
www.differencebetween.info/difference-between-burger-and-sandwich

looks very very American... maybe is something like our italian "panino" and "tramezzino"

only one further useless question: have you eat that with knife and fork??

edit: strikethrough what may generate flames. and wars.