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alexwee123Best ResponseYou've already chosen the best response.0
because there is only one factor for 1 and a prime number requires 2
 one year ago

mahmit2012Best ResponseYou've already chosen the best response.0
caz many theorem will fail
 one year ago

jim_thompson5910Best ResponseYou've already chosen the best response.1
The fundamental theorem of arithmetic states that you can represent any number uniquely as a product of primes If 1 were prime, then a number like 12 can be written as 12 = 2*2*3 12 = 1*2*2*3 12 = 1*1*2*2*3 ...etc so 12 is being represented as a product of primes but it's not unique. So make the representation unique, we exclude 1 from being prime Note: the order of the factors doesn't matter
 one year ago

superhelperBest ResponseYou've already chosen the best response.1
because nothing can go into it besides itself
 one year ago

SmoothMathBest ResponseYou've already chosen the best response.2
Every prime number has exactly two factors! For example, 2 is prime because it only has factors 1 and 2. 3 only has factors 1 and 3. 5 only has factors 1 and 5. Now, most nonprimes, it's easy to realize, "Oh, okay, it has more than 2 factors." 1 is the unique case where it has fewer than 2 factors. Just 1 =/
 one year ago
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