http://en.wikipedia.org/wiki/17th_century
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The 17 hundreds were the 18th Century.(How to remember it:The years from 1 to 100 were the "first" century. So the name ofthe century is the name of the even hundred at the end of it.)
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a Century is just 100 years, that why people say we are in the 21st century and that world war 2 happened in the 20th century, so 2.5 centuries would be 250 years
we dont know yet.....
17 centuries. From the last day of the 9th century BCE to the first day of the 9th century AD was just over 1600 years while From the first day of the 9th century BCE to the last day of the 9th century AD was just under 1800 years.