6 is the only single digit perfect number.
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6 is the only perfect digit. The next perfect number is 28.
Place value only makes sense for a single digit - not a 4-digit number!
The only other single-digit number higher than 5 which is a prime number is 7 - 9 is equal to 3 squared, and is thus not a prime number.
A number cannot have a place value, only a single, specified digit in a number can.