prime number


a prime number has exactly 2 factors : itself and 1

 

2 is the only even prime number

2 and 3 are the only two consecutive prime numbers

 

 

 

composite number

a composite number has more than 2 factors

 

 

 

1

the number 1 is neither prime nor composite

it has only one factor – itself

 

 

 

coprime

two numbers are said to be coprime if their highest common factor is 1

 

 

 

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