Which metric prefix represents a factor of one-thousand?

The metric prefix that represents a factor of one-thousand is "Kilo." In the metric system, "Kilo-" signifies a multiplication by 1,000, which is pivotal in differentiating measurements, particularly in fields such as science and engineering. For example, one kilometer is equivalent to 1,000 meters, reflecting the convenient nature of the metric system in scaling units by powers of ten.

In contrast, the other prefixes represent different factors: "Centi-" denotes a factor of one-hundred (1/100), "Milli-" indicates a factor of one-thousandth (1/1000), and "Micro-" signifies a factor of one-millionth (1/1,000,000). Understanding these prefixes is essential for accurately interpreting measurements and converting between different units in various applications.