prime numbers
Those are the first four prime numbers.
2, 3, 5, and 7.Prime numbers obey the simple rule: Prime numbers can only be divided by 1 and themselves. Which means that they only have two factors.1 is also sometimes considered a prime number, but it is not. It has only one factor, so disobeys the rule.
Themselves because they are all prime numbers.
It is not a rule as such; those number are the first 10 prime numbers.
5 and 7 are both prime numbers.
7 is a prime number but 9 is a composite number
from 7 to 19 the prime numbers are 11, 13, and 17
3, 7 and 11 are prime numbers.
The prime numbers from 1 to 7 are 2, 3, 5 and 7.
7 is a prime number; its only prime factor is 7.
Prime numbers like 2, 3, 5 and 7.