An integral number is an integer. A whole number positive, negative or zero.
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Any number that is less than 0. Any rational irrational or integral number that is less than 0 is considered negative.
Every number except zero is a factor of every other number. Usually this kind of question is intended as a question about integral factors, those that can be paired with another integer to produce the number as a product. In that sense, 9 is not an integral factor of 11, because the paired number with 9 is 11/9, a number that is not an integer.
Yes. 47 is a prime number because no positive integral number less than 47 apart from 1 divides without remainder into 47.
Yes, this is well known. All integral multiples of any perfect, or abundant number must be an abundant number.
8 is the smallest INTEGRAL power of 2 which is greater than 4.