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That depends on where you start and in what direction you proceed. If you list the prime factors in the order from smallest to largest, then the first two are 2 and 3, and their sum is 5.
98 is the largest two digit number divisible by 7.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
For this type of "the largest number which..." questions, you need to advance from left to right, using the largest possible digit in each case. For the first two digits, that would be 9, for the third digit (the right-most digit), the largest digit which will make this possible is an 8.