A Prime number is any number that only has one and itself as factors. By definition even numbers have a factor of two. Therefore the greatest and only even number that is prime is the number 2.
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8243 is a prime number, but there is no greatest prime number.
43 is the greatest prime number of 860
well in the number 7493 the number 7 is the greatest prime number
The greatest factor of any number is the number itself. The second greatest factor of any even number is half the number. The second greatest factor of any composite number is the number divided by its smallest prime factor. The second greatest factor of any prime number is 1.
The greatest prime number below 25 is 23.