All numbers are not natural numbers.
Natural numbers are 1,2,3,4,5....
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The set of rational numbers includes the set of natural numbers but they are not the same. All natural numbers are rational, not all rational numbers are natural.
It depends, many people do count 0 as a natural number, but MOST do not. So for most HS text book, the answer is NO, all whole numbers are not natural numbers and the reason is 0 is a whole number but not a natural number.
All prime numbers are natural numbers. So yes, some natural numbers are prime numbers.
No. All natural numbers are whole, so they are rational. Irrational numbers like pi and the square root of 34 come in decimals.
Whole numbers are the set of natural or counting numbers inclding zero