Yes but only out of historical interest.
No. Greek is a language, a culture, an ethnic group etc. But it is not a number system.
The number system used by the Greeks in the first millennium was called Aegan System. Attic Numerals was later formed on which the Roman System was built. The Attic Numerals used the first letter the name of the number the represented.
No it did not
They needed it to do arithmetic - to count, calculate and record numerical data.
Greek numerals are a system of representing numbers using the letters of the Greek alphabet. The first Greek number system we examine is their acrophonic system which was use in the first millennium BC. 'Acrophonic' means that the symbols for the numerals come from the first letter of the number name, so the symbol has come from an abreviation of the word which is used for the number. Here are the symbols for the numbers 5, 10, 100, 1000, 10000. No one has claimed to be the author.
maybe or maybe not Whenever we use paragraphs marked with a, b, c, d..... or A, B, C, D...the Greek numbering system is used.
The unit zero
Greek System
nothing
No, the Ancient Greek number system did not use zero as a place value, or number for that matter.
The Dewey decimal number for Greek civilization is 938 in the Dewey Decimal Classification system.