1 and 2 are prime numbers.
Another Answer:-
It is only 2 that is a Prime number because 1 is not considered to be a prime or composite number.
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Prime numbers are numbers that are divisible by themselves and 1. 1 itself is not regarded as a prime number. With the exception of 2, all prime numbers are odd numbers. Applying this gives the following prime numbers less than 25 :- 2,3,5,7,11,13,17,19 and 23.
2/5 of the numbers from 1 to 20 are prime numbers
The prime numbers from 1 - 5 are 2, 3, and 5.
Prime numbers have no factors. They are numbers that are divisible by only themselves and the number 1. Therefore, of the set {1, 2, 3, 4, 5, 6, 7, 8, 9}, the following numbers are primes: {2, 3, 5, 7}
The factors of 72 that are prime numbers are 2, 3, and 5. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves without leaving a remainder. In the case of 72, it can be broken down into the prime factors 2^3 * 3^2, where 2 and 3 are the prime factors.