Yes.
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It can be.
No it is not.
A whole number is definitely a real number! For example say you have the number 7. 7 is a real number, because it doesn't have any decimals or fractions! Hope that helps! A whole number is a real number. A real number can be a fraction, a negative, a positive number, rational, or an irrational number. A whole number is a positive number or zero.
YES. Every whole number is a real number too.
It is all of them except an irrational number.