Indian on Opt and F1 , J1, B1, visa are around 2-4 millions.
Impossible, since According to the 2010 United States Census, the Asian Indian population in the United States grew from almost 1,678,765 in 2000 (0.6% of U.S. population) to 2,843,391 in 2010 (0.9% of U.S. population), a growth rate of 69.37%, one of the fastest growing ethnic groups in the United States.
Indian Americans are the highest-income and best-educated people in the United States and the third largest among Asian Americans who have surpassed Latinos as the fastest-growing racial group, according to a new survey.
I have personally known or met over 50,000 Indians since my arrival on student visa in 1960. Majority have acquired citizenship. I was granted citizenship in 1970.