There is no such number since you cannot list every non-zero number!
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A multiple
Itself because 1 times a number = the same number
Yes. Every non-zero number is divisible by itself.
1.0070 has 5 significant figures. This is because when you are looking at a number with a decimal number, you start from the left and find a non-zero number. When you find the non-zero number, every number after it is significant.
This can not be done. Every non-negative number on the number line is the square root of its square. You would have to mark every number from zero on.