Yes, you can send email to multiple emails. See example T-SQL below to create a SQL Agent Operator with 3 email addresses:

EXEC msdb.dbo.sp_add_operator @name=N'SQLAgentOperator',

@enabled=1,

@weekday_pager_start_time=90000,

@weekday_pager_end_time=180000,

@saturday_pager_start_time=90000,

@saturday_pager_end_time=180000,

@sunday_pager_start_time=90000,

@sunday_pager_end_time=180000,

@pager_days=127,

@email_address=N'First.Operator.Email@email.com;SecondOperatorEmail@email.com;Third.OperatorEmail@email.com;',

@category_name=N'[Uncategorized]'

GO

Note: the above code has been tested...