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Technically, yes, because you can multiply 99 by 1 and still get 99.
The number before 99, that is, 99 - 1.
When you multiply a number by 1, it stays the same. When you multiply a number by a number greater than 1, it increases. When you multiply a number by a number that is less than 1 (a proper fraction), it decreases.
Sum 1 + 2 ... + 99 + 100 = 5050
99 is not a prime number because it has more factors than 1 and itself. The factors of 99 are 1, 3, 9, 11, 33, and 99.