Which number is not a composite number 2 9 15 21

Question

Mathematics

Dalton Bryan

27 August, 11:18

Which number is not a composite number 2 9 15 21

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Answers (2)

Know the Answer?

Amy Weber · Answer 1

2 is not a composite number but it is actually a prime number because it is only divisible by one and itself and only composite numbers have more than just 2 factors so since 2 only has 2 factors, it is a prime number.

Casey Ramsey · Answer 2

Factors:-

2 = 1, 2 (Prime)

9 = 1, 3, 9 (Composite)

15 = 1, 3, 5, 15 (Composite)

21 = 1, 3, 7, 21 (Composite)

So, 2 is not a composite number in this list.