All prime numbers are deficient.
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No, all prime numbers are deficient.
Yes.
91 cannot be in the prime factorization of any number because it is not a prime number itself.
A prime number is any number that only has one and itself as factors. Therefore, any number that has more than two factors is not prime. Check the the factors of a number to tell if it is prime or not.
Yes. The number two. After that, any other even number would be divisible by two and not a prime number.