Q: What is the only single digit perfect number?

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4

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.

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4

A 3-digit number cannot have a pace value. Only a single digit can.

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!

4

7 * * * * * What? 73 = 343 which is the square of 18.52... hardly a perfect square! The correct answer is 9.

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.

Its impossible, there are only 5 single digit numbers that are not prime

A number cannot have a place value, only a single, specified digit in a number can.

A number does not have a place value - only a single digit within a number does.

Yes. The zero is only acting as a place holder.

It depends on the number of people who voted.