Which of the following is true?

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

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

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

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

Question

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

anonymous · Answer

composite numbers have factor or numbers that you can multiply to get to that number but prime numbers does not it only has 1 and itself

anonymous · Answer

The correct answer is B

anonymous · Answer

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

anonymous · Answer

@JAMG  can you dumb it down a little ?

anonymous · Answer

Why is B correct ?

anonymous · Answer

composite = made of parts (factors)  lets look at 28
1*28 = 28
2*14 = 28
4*7 = 28

2, 3, 5, 7, 11, 13 are all prime numbers because you can only get that number 
if you multiply that number times 1 there are not other numbers (factors)

anonymous · Answer

so B ? @JAMG  <3

anonymous · Answer

yes, sorry I didn't realize I didn't answer the question

anonymous · Answer

lol its ok thank you :)