All prime numbers have exactly two factors. There is not a prime number below 50 that has the most factors since they all have the same number of factors.
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59 is a prime number. Its factors are 1 and 59.
no
2 and 7
57 is a prime number. 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.
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.