No, 0.55 is not a natural number.
Natural numbers are counting numbers like 1, 2, 3, 4, 5, 6, ... thus, decimal numbers are not natural numbers because we do not count using decimals.
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there is a zero in a natural number.
No natural number is irrational.
Zero is a natural number.
0 is whole no but not a natural no.
Yes a real number is a natural since real is natural so anything real is natural and so a real number is natural.