There are no factors other than 1 and 13 that go into 13, as it is a prime number.
A number with more than two factors is composite
A composite number
A composite number
composite
We call them by the number of their digits. Two-digit number, three-digit number and so on.
Let's call "a number" x. Then 5 more than twice x is 5 + 2x.
There is no specific name: you just call it a number with 2 or more digits or a multi-digit number.
call the company its most likely a accident
51 is a composite number because it has more than two factors.
It is a composite number and a number with only two factors is a prime number
you call it a negative number because it's smaller than 0.