Since there is 1,000 years in a millennia and 10 years in a decade, you would divide 1,000 by 10. You will get 100 decades.
Two millennia is equal to 200 decades.
5000000
300.
There are 100
672365
300 of them
900
The answer depends on 6.5 WHAT! Seconds? Millennia?
1 millennia =1000 year 8 millennia =8000 yrs
1 millennia =1000 year 6 millennia =6000 yrs
1 millennia =1000 year 9 millennia =9000 yrs
1 millennia =1000 year 2 millennia =2000 yrs