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There is no set formula to make a prime number into a composite but usually adding 1 will work. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0.
Tooth filling can be a great thing for any person. The removal of tooth from the mouth due to cavities, decay etc. can be difficult as it might cause infections in the other teeth too. White composite fillings is a good way to fill the gap between teeth properly.
21 is composite.
27 is composite.
composite