Lonely because it does not have any predecessors. It starts the number series.
Any natural number and 0
No, any number with a decimal is not natural. Natural numbers are 1,2,3... Any number that has a terminating decimal, is not 0, is rational, and is not a negative.
The League of Nations
No, there is no such number.
Yes. Any whole number starting from 1 is a natural number.
yes, 3 is a natural number. any positive number is.
YES. Any even natural number is a multiple of 2.
Any negative whole number is not a natural number - so it is not "the only".
9 is a natural number, as is any whole number greater than zero.
The prime number 53 is a natural number, as is any whole number greater than zero.
Any number that has non-zero digits after the decimal point is NOT a natural number.