Hello vanita and welcome to the Dubai forums
As far as I know, a Muslim male is allowed up to 4 wives (not sure if they all have to be Muslim) in Dubai. I don't know if this applies only to Emirati citizens or other nationalities also.
A Muslim female can only have one husband, who must be Muslim if getting married in Dubai.
In other cases in the UAE, a person is only allowed to have one spouse, and must be single, divorced, or widowed before getting married.
See Marriage in Dubai
for more information, and/or check with the Indian embassy in Abu Dhabi or consulate in Dubai.