1, 2, 3, 5, 7.
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September has 19 days that are prime numbers Note: 1 is not prime or composite
Prime numbers before 10 are 2 3 5 7 So 4
There are more than 10 prime numbers
There are 4 prime numbers between 10 and 20. They are 11, 13, 17, and 19.
Numbers that have exactly 2 factors under 10 are prime numbers. Prime numbers are integers greater than 1 that have no positive divisors other than 1 and themselves. Examples of prime numbers under 10 are 2, 3, 5, and 7. These numbers have only two factors, 1 and the number itself.