def multiply(self, other):
if not isinstance(other, Number):<EOL><INDENT>raise QiskitError("<STR_LIT>")<EOL><DEDENT>return Operator(other * self.data, self.input_dims(),<EOL>self.output_dims())<EOL>
Return the operator self + other.

        Args:
            other (complex): a complex number.

        Returns:
            Operator: the operator other * self.

        Raises:
            QiskitError: if other is not a valid complex number.