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Mathematicians define a Prime number as one with exactly two factors. 1 does not qualify.
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How do you know immediately that 2056 is not a prime number?
A prime number is a number whose only positive integer factors are itself and 1. Since 2056 ends in a 6, you know the number is divisible by 2 and therefore cannot possibly be prime.
Is 37 prime?
Yes it a prime number because it has only two factors and you will know if a number is prime factor if it's factors are only 1 and itself.
Is 1 the lowest prime number?
No; 1 is not a prime number. The lowest prime number is 2.
Why do you need to know about prime and composite numbers?
If you know a number is composite, then you also know that it can be factored into more factors than just 1 and itself. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
Can 1 be a prime factor of a number?
No - as 1 is not a prime number.
