Consider the numbers 13, 16, 27, and 41.
a. Which of these numbers are prime? How do you know?
b. Which of these numbers are composite? How do you know? in two sentences
a. The number 13 is prime because it is only divisible by 1 and itself. The numbers 16, 27, and 41 are composite because they have factors other than 1 and themselves.
b. The numbers 16 and 27 are composite because they have factors other than 1 and themselves. The number 41 is prime.