Which is a counterexample to this conjecture?

the sum of 3 and any other number is an odd number.

a.
3 + 4 = 7

b.
3 + 51 = 54

c.
3 + 58 = 61

d.
3 + 98 = 101

For the answer to the question above, the answer must be B. 3 + 51 = 54

Because counter conjecture means that 54 has 2 or more factors. While conjecture means it has just 1 and the number itself are the factors like 13.
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