Recall that

is only defined for

, and under this condition we have that

. But 1.7 > 1, so

is not a real number.
A composite number is divisible by other numbers, including 1 and itself.
Opposite of composite is prime, so we need to look for the PRIME number.
2 is a prime number because it is only divisible by 1 and itself(2).
Answer: 2
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