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When you write a very large number, say seven digits, then you place a COMMA ( NOT a period) , at every third number. e.g. # 1234567 = 1,234,567 The period/Full stop is only used to delineate decimals.
If it is at the end of a sentence then yes however if not then no
You should write it in full in any formal or academic writing.
55000 or 55,000. Sometimes, the comma separator (for thousands) is replaced by a full stop, or a space.
Rational