No. 3x7=21. 21 can be divided by 3 and 7 of course. You can multiply anything and the product would always be composite (except 1 and 0). Hope this helped :)
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As for example expressed as a product of its prime factors 210 is 2*3*5*7
As a product of its prime factors: 3*5*7 = 105
If you mean the product of its prime factors then it is: 2*3*3*7 = 126
It is: 2*3*7 = 42
It is: 3*5*7 = 105