No. Natural numbers are 0, 1, 2, 3 ...
If a was defined to be a negative integer, then -a would equal a natural number. But -a is a variable with a sign, not a natural number.
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there is a zero in a natural number.
No natural number is irrational.
0 is whole no but not a natural no.
Zero is a natural number.
Yes a real number is a natural since real is natural so anything real is natural and so a real number is natural.