The spelling is "prime meridian". That is the meridian from which counting begins; i.e., the prime meridian, by definition, has longitude zero, and degrees are counted to the east and to the west of the prime meridian. In the international system currently used, that is the Greenwich meridian - a meridian that goes through the Greenwich Observatory in London.
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Prime Factorizaton of 51The prime factorization of 51 is:3 X 17Both numbers are prime, so 3 X 17 is the prime factorization of 51.
It's clearly not prime; no even number is prime. It is composite.