I see no reason to capitalize it. In general, you capitalize something if it is the name of a single, unique thing (for example, the name of a person or country); or if something is considered sacred or otherwise important. There are a few additional cases when you capitalize something, but I don't see how any of them would apply in this case.
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No you do not need to.
2.5 million dollars
2224.4 million dollars means 2224.4 times 1 million dollars 1 million dollars is $1,000,000 → 2224.4 million dollars = 2224.4 x $1,000,000 = $2,224,400,000 which is two thousand million, two hundred and twenty four million, four hundred thousand dollars, but as the USA uses the short scale (based on power of a thousand plus one) it can be read as: two billion, two hundred and twenty four million, four hundred thousand dollars
Two million Four hundred thousand dollars.
0.02 x 20 million = 400,000 dollars