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A Prime number is a number that only has two factors. That is, it can only divide evenly by 1 and itself. 17 cannot divide by any number in between 1 and itself. Thus it has only two factors. Therefore 17 is a member of the prime number set.
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Is twenty-one a member of the prime number set?
A prime number is a number that only has two factors. That is, it can only divide evenly (without leaving a remainder) by 1 and itself. 21 can divide by 3 to give 7. Therefore it has more factors than just 1 and itself. Thus twenty-one is not a member of the prime number set.
What is the set of even number prime?
It is the set {2}.
What is the intersection of the set of all prime numbers and the set of all even numbers?
2 is the only member of both the set of all prime numbers and the set of all even numbers.
What number is the 20th prime number in a set of numbers from 1-100?
The 20th prime is 71.
-7 is a prime number?
No it is not. By definition, a prime number must be a natural number. Negative numbers are not in the set of natural numbers.
