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Any of the negative integers (-1, -2, -3, ... ) is whole but not natural.
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.
No. The natural numbers are the counting numbers 1, 2, 3, ...
No. For two reasons: 1) Negative numbers are not natural numbers 2) All natural numbers are rational numbers but the square root of 6 is an irrational number and thus cannot be a natural number.
1 is nether prime or composie, the only natural numbers like this. 0 and negative numbers are not natural numbers.