It is stretching it a bit, but it could be argued that every number has a magnitude and a sign.
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Yes. Real numbers are points along a continuous infinite number line with its midpoint at 0.
Every number greater than 1 has the two factors 1 and the number itself.
Any (and every) number can be multiplied by 180.
Because your beginning number was a multiple of 2.
No, every number has at a minimum two factors, which are itself and 1. If these are the only two factors, then the number is prime. If it has more factors, then the number is composite.