Five. e.g. Pentagon = 5 sided polygon.
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It's a prefix meaning "nine"
Yes, it is a prefix meaning a thousand.
In math Kilo is the metric prefix meaning 1000 times.
It adds to math by kilogram == It is a prefix meaning 1000 e.g. a kilometer is a thousand meters, a kilogram is 1000 grams, etc.
Its from the greek word pente (πεντε) meaning five (5). Also the other part of pentagon is greek. It means ''angle''. Pentagon means (a structure) that has five angles.