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19 is a prime number, but it is not a factor of 200.
The answer is :::: 2 ::::::::
25 is the greatest common factor. 5 is the greatest prime factor.
As a product of its prime factors in exponents: 2^3 times 5^2 = 200
The knowledge of prime numbers is useful when finding the lowest common multiple or the highest common factor of two or more numbers.