Even integer
An even integer is any integer which is a multiple of 
The even integers are 
; specifically, note that 
is even. Every even integer can be written in the form 
for some unique integer 
.
The sum and difference of any two even integers is even, and the product of any two even integers is not only even but is also divisible by 
The sum of an even integer and an odd integer is odd.
Since every even integer is divisible by 
is the only prime even integer.
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