The number is 9.
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Two number are co-prime if there is no whole number other than 1 that divides them both exactly
The number 4 divides exactly into 16. This is because 16 divided by 4 equals 4, with no remainder. In general, a number divides exactly into another number if the division results in a whole number quotient without any remainder.
163 / 100 No number, other than 1, divides into both numbers, I think.
A prime factor of a number is a prime number that evenly divides the number. A composite number is a number having more factors than just 1 and itself.
Yes. 47 is a prime number because no positive integral number less than 47 apart from 1 divides without remainder into 47.