XXX 1,500,000, where XXX is the international prefix for the relevant dollars. That prefix will depend on whether they are Australian, Canadian or some other dollars.
The prefix giga- usually refers to a multiplying factor of one billion; a gigahertz is one billion cycles per second.
The prefix giga means 10^9 in the International System of Units (SI), therefore, one Gigabyte is 1,000,000,000 bytes (one with nine zeroes). 1 gigabyte (GB) = 1 billion bytes.
There is no special prefix for that factor. There are SI prefixes for powers of 10 (10, 100, 1000, 0.1, 0.01, 0.001), and especially for powers of 1000 (1000, a million, a billion, 1/1000, etc.)
The prefix for 1000 in the International System on Units is milli. For example, one milligram is one-one thousandth of a gram.
The prefix is inter-. The suffix is -al.
If you mean 10 to the power plus 3, the answer is kilo.