Presumably your question was meant to be: What is a number called when it is divisible only by itself and one? This type of number is called a prime number. Some examples of prime numbers: 2, 3, 5, 7, 11, 13, 17, 19 ........
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prime
It is divisible by 1 and itself.
composite or not a prime number (as long as you mean divisible by something other than 1 and itself)
It is not prime because it is divisible not by 1 and itself, but only 1 or itself. The definition of prime is divisible by 1 and itself. It is not composite because it is not divisible by an whole number other than 1.
If the number is only divisible by 1 and itself, then that number is called prime number.E.g. 7 is only divisible by 1 and itself, i.e. 7. Hence, 7 is a prime number.