12, 24 and 36 all qualify...
It can have up to 5 digits.
81
You had me until "product." The product of 4 digits can't be prime.
121
-10
It can have up to 5 digits.
Six.
81
You had me until "product." The product of 4 digits can't be prime.
362x(3x6)
-109
1
121
The number is 83.
-10
804
2