1 is a non-rectangular number. The only factor of 1 is 1.
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There is NO number with the most number of factors.
A number that has more than two factors is a composite number whereas a number that has only two factors is a prime number.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. The set of prime factors is a subset of the set of factors for any given number.
No, square numbers have an odd number of factors.
A prime number only has two factors. If the number you're looking at has more than two factors, it is not prime.