A composite number is an integer that is positive and has factors other than 1 and itself.
Is 80 composite? -----> Yes
It's because 80 has the factors of:
⇒ 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
(Other examples)
Is 23 composite? ------> ?
What are the factors of 23?
⇒ 1, 23
· the factors are only 1 and itself thus, making it prime so the answer is no.
Is 45 composite? -----> ?
What are the factors of 45?
⇒ 1, 3, 5, 9, 15, 45
· the factors consist of numbers other than 1 and the number itself therefore, the answer is yes, it is composite.
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