Which of the following is true?

twenty-one is a composite number because one and twenty-one are its only factors.

thirteen is a prime number because it is only divisible by one and itself.

sixteen is a prime number because it is divisible by 4.

twenty-eight is a composite number because eighty-two is a prime number.

Question

Which of the following is true?

twenty-one is a composite number because one and twenty-one are its only factors.

thirteen is a prime number because it is only divisible by one and itself.

sixteen is a prime number because it is divisible by 4.

twenty-eight is a composite number because eighty-two is a prime number.

jigglypuff314 · Answer

a prime number is only divisible by one and itself.