In every math problem you can ever do you can use prime numbers.
1+3
Both prime numbers. Most numbers are not prime but prime numbers only become a broblem when you try to factor them like in simple algebra.
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The difference between prime and composite numbers is simple. Prime numbers have only two factors, 1 and itself. Composite numbers are divisible by more than two numbers
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
Products of prime numbers are composite numbers.
The opposite of prime numbers are composite numbers.
There are more than 25 prime numbers; there are an infinite number of prime numbers.