5 is prime.
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5 is but 15 is not a prime number
The prime factors of 15 are: 3, 5
11 and 13
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
Number of Prime Numbers from 1 to 100 is 25. From 1 to 50 it was 15 From 50 to 100 it was 10