Question

which number is composite? 13 83 37 27

Explanation:

Step1: Recall composite number definition

A composite number is a positive integer that has at least one positive divisor other than one and itself. Prime numbers have only 1 and themselves as divisors.

Step2: Analyze 13

13: Divisors are 1 and 13. So it's prime.

Step3: Analyze 83

83: Divisors are 1 and 83. So it's prime.

Step4: Analyze 37

37: Divisors are 1 and 37. So it's prime.

Step5: Analyze 27

27: Divisors are 1, 3, 9, 27. Since it has divisors other than 1 and itself, it's composite.

Answer:

27 (the number in the bottom - right box)