Prime factorizations are unique. No other number will have exactly the same number of prime factors as 28. Multiples of 14 will have some of the same factors.
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28 is not a prime number because it is divisible by 2, 4, 7, and 14. Prime numbers are only divisible by 1 and themselves without any other factors.
To find the prime factors of 28 start with any factor pair of 28 and keep factoring the composite factors until all the factors are prime. 28 2 x 14 2 x 2 x 7 The three prime factors of 28 are 2, 2, 7.
No two numbers have the exact same factors.
17, 19, and 23. All the other numbers have more than two factors.