its easy just add them then multiply them then find the square root then add 5 million then divide!
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No it would be 2-3 digets depending on the number.
Because it is relatively easy to divide the number into a group of 1 and 3. Much harder to do that with a 16-digit number!
Divide the two-digit number by the one-digit number. If the remainder is zero then the 2-digit number is a multiple and if not, it is not.
81 is.