What prefix indicates one million of a base unit?

The prefix that indicates one million of a base unit is "Mega." In the International System of Units (SI), "Mega" is used to denote a factor of 10^6, which is equal to one million. This is commonly used in measurements such as megawatt (MW) for power and megabyte (MB) for data storage, representing a substantial quantity of the respective units.

Understanding the significance of "Mega" is important in various engineering and scientific applications, where large-scale measurements are frequent. For instance, when discussing energy consumption, power generation, or data transmission, recognizing that "Mega" signifies one million units helps engineers effectively communicate and manage large quantities.

The other prefixes, while they also represent significant quantities, indicate different scales. "Giga" represents one billion (10^9), "Kilo" signifies one thousand (10^3), and "Hecto" indicates one hundred (10^2). Hence, it is clear why "Mega" is the correct choice for the prefix denoting one million.