No. One of the group axioms is that each element must have an inverse element. This is not the case with integers. In other words, you can't solve an equation like:
5 times "n" = 1
in the set of integers.
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Yes
no
The set of positive integers does not contain the additive inverses of all but the identity. It is, therefore, not a group.
Any set where the result of the multiplication of any two members of the set is also a member of the set. Well known examples are: the natural numbers (ℕ), the integers (ℤ), the rational numbers (ℚ), the real numbers (ℝ) and the complex numbers (ℂ) - all closed under multiplication.
Yes, it is.