That would be "mega".
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No, a kilometer is 1000 meters (kilo is a Greek prefix used by SI for one thousand. Mega is the prefix for one million)
centi
Quadrillion may mean either of the two numbers (depends on long and short scales):1,000,000,000,000,000 (one thousand million million; 1015; SI prefix peta) - increasingly common meaning in English language usage.1,000,000,000,000,000,000,000,000 (1024; SI prefix yotta) - increasingly rare meaning in English language usage. It is 1,000,000,000,000,000.Simply put, in the English language, it is "one thousand trillion."
A megaton is equivalent to the destructive power of 1,000,000 (a million) tons of TNT. "Mega" is used as a prefix meaning "a million".
It is the prefix meaning '10'.