how to know if a command was successful on remote server

[Dolphin06]

Hello i m sending command to remote server, in my script on my local machine.
I would like to know how can i return a value if the command on the remote
server failed.
on my script on local machine :

#! /bin/bash

#how can i get a returned value from this ?
ssh $USER@$SERVER remotescript param

Thank you.
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