8 is, because it's the only perfect cube.
39 is, because it's the only one divisible by 13.
51 is, because it's the only one divisible by 17.
123 is, because it's the only one divisible by 41.
124 is, because it's the only one divisible by 31
892 is, because it's the only one divisible by 223.
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An odd number.
Addition of two odd numbers will always give an even number.
Square numbers have an odd number of factors.
No, only every other multiple is odd. Example: 3,6,9,12,15,18
If the number is odd, that's the answer. If the number is even, write down all the factors and choose the largest one that is odd.