return is a statement.
If you all are going to nit-pick. Because C and C++ do not have commands or instructions.
The trick is to realize that we say numbers in groups of three digits.
183 --> one hundred eighty three
183,000 --> one hundred eighty three thousand
183,012 --> one hundred eighty three thousand twelve
Thousands, millions, billions, etc are powers of 1000.
If we really want to be pedantic, return is a keyword.
return; is a statement.