Commas are used to delineate every third (thousands)digit. Full stops/periods are only used to separate digits from decimals.
e,g 123456789
Commas. 123,456,789 ; said as 'One hundred and twenty three million, four hundred and fifty six thousand, seven hundred and eighty nine.
Decimal 123,456.789 ; said as ' One hundred and twenty three thousand, four hundred and fifty six, point seven eight nine'..
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The commas between numbers in place value are commas.
I believe that when you have an appositive in a sentence that when it is not necessary you surround it with commas and when it is necessary, you don't use commas. This is what I believe the rule is, but I am not 100% sure. Anyone feel free to correct me if this is in any way not correct.
6000000
Easy, the commas separate the numerical units. 1,000 is one thousand. 1,000,000 is one million and so on.
Generally you use commas to define triplets of numbers (from the right). so 300698 = 300,698