2 x 14 = 28
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286 = 2 x 11 x 13
2 x 2 x 7
A 3 or 4 digit number.
It can be: (5*6)-21 = 28
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.