All even numbers.
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The only number that has 2 factors is the number 2.
number factors for :12=2*2*318=2*3*326=2*13
No a prime number has only 2 factors which are itself and one but a composite number has more than 2 factors
If a number has more than two factors, it's composite.
The maximum number of zeros in a number is determined by the number of factors of 10 in that number. Each factor of 10 is made up of 2 factors of 5 and 2 factors of 2. Therefore, the maximum number of zeros in a number is equal to the minimum of the number of factors of 5 and the number of factors of 2. For example, in the number 1000, there are three factors of 10, so the maximum number of zeros is 3.