It is 3 or 11
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43 is the only prime number in that list; 33 and 63 are both divisible by 3.
No they are not. They have more than the number 1 as a common factor. They also have the number 3 as a common factor.
No prime numbers can be equal to 33, as 33 is not a prime number. It is divisible by 3. Prime numbers are only divisible by 1 and themselves, and 33 does not meet this criterion.
3 x 11 = 33