The urinary organ is still considered to be najis, but his previous prayers are not void if the person was unaware of the najasah on the body or the clothes. However, for future prayers he must make the part tahir with water.
Yes, it is permissible; but it is not permissible to buy shares of companies that deal with prohibited matters like wine and pig and the like, if the buyer becomes a partner in owning such things.
In this situation, the woman should have the ghusl of menstruation and she offer the prayers during the clean days. If she did not do so then she must offer the prayers as qadha. She should consider the periods of bleeding as menstruation, even if they were separated by clean periods.
