When calculating basic earnings per share, you only deduct dividends if they are preferred dividends.
If you were calculated diluted earning per share, then you would include regular dividends.
Therefore your formula would be : 9,000,000 (net income)/ 3,300,000 (total share outstanding)
shares : ( 600,000 x 6/12) + 3,000,000 = 3,300,000