Solution
A positive integer $$n$$ is a composite number if it has factors other than 1 and itself.
A positive integer $$n$$ is a prime number if it has only two factors (1 and itself).
209 is composite no whose factor are 1,11,19,209
203 is composite no. whose factor are 1,7,29,203
161 is composite no. whose factor are 1,7,23,161
109 is not composite no, whose factor are 1,109 only
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