The product of four and a number would be algebraically written as 4n, or whatever variable equals the number. In this case, n = number. It would not be written n4, nx4, 4xn, 4*n or n*4, although n4 and the ones with stars may be accepted by a teacher.
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four times the number
-1
You had me until "product." The product of 4 digits can't be prime.
14
4n - 6