Which of the following numbers are not prime ?
$2, 6, 14, 19, 11, 09, 13, 21, 10, 15, 5$

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Solution

Given , the numbers are $2, 6, 14, 19, 11, 09, 13, 21, 10, 15, 5$
Prime number : Prime number are those numbers which have maximum two factors.
The numbers $6, 14, 09, 21, 10, 15$ have more than two factors .
Example : $6 = 2, 3, 1$
Hence , the required numbers which are not prime they are $6, 14, 09, 21, 10, 15$ .

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