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a multimer (aka oligomeric protein) is a protein that’s made up of more than one polypeptide chain stuck together is called multimeric. Some proteins are only multimeric are always stuck together but other proteins can exist alone (as a monomer) or as part of a multimer. Multimers can contain multiple copies of the same chain (we call these homomeric/homomers) or different chains (we call these heteromeric/heteromers). Multimers made up of 2 chains are called dimers, 3 chains gives you a trimer, 4 a tetramer, etc. “Quaternary structure” refers to the level of protein structure that comes from interactions between the different chains.