GMAT Quantitative Reasoning Practice Test 8

The question alone provides little information. Notice that it does not say that X, Y and Z are different.
Statement (1) tells us that XYZ is divisible by 4 and therefore two of the prime numbers are 2, meaning that only one of the prime numbers are odd.
Statement (2) completes statement (1) by adding that X is odd and therefore Y and Z must be equal to 2. Both statements, taken together, are sufficient.