The factors of 21 are 1, 3, 7, and 21.
The only factor of 21 that is a composite number is 21.
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Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
composite numbers are those that have more than 2 factors. all even numbers other than 2 are composite numbers and some odd numbers are composite numbers. numbers that are prime are the numbers that are not composite numbers i hope this answers your question :)
No. Prime numbers cannot be composite and composite numbers cannot be prime!
All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.
There are not 10 laws of composite numbers so the question is based on a complete misunderstanding of what composite numbers are!