Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
5 is prime, the rest aren't.
25 = 23 + 2
They are: 29 and 31
4 and 25 are not prime numbers.
23 + 2 = 25
The GCF of two prime numbers is 1. 4, 9 and 25 are relatively prime.
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
2 + 23 = 25
There are more than 25 prime numbers; there are an infinite number of prime numbers.
4, 18
Neither 1,315,118 or 25 are prime numbers because they have more than two factors
25 and 98 are not prime numbers
29 and 31
29
5 is prime, the rest aren't.
By definition, two numbers say a and b are relatively prime if and only if the gcd (a,b) = 1.The two pairs are (5, 16) and (16, 25).