Lowest (or Least) Common Multiple.
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you cannot multiply by others numbers only by 1 and the number itself
Negative integers are whole numbers but not natural numbers. Mathematicians are undecided about zero. It is a whole number: some believe zero is a natural number, others do not.
Yes. Consider as the simplest example: i * i = -1. But there are others: (a + bi)(a - bi) = a² + b². When you multiply conjugates, the result is always real. This is useful when dividing to get a pure real number in the denominator.
The answer depends on your familiarity with number bonds.
The smallest square integer is 1. The 169th one is 28,561. Between these two, there are 167 others ... too many to list here.