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4 is the only number which is divisible by only itself, 1 and 2.
If you mean what do you call a number with only 1 and itself as factors, then it is a prime number.
A number with only two factors, 1 and itself, is a prime number.
Since every number has 1 as a factor, and 1 is not prime, then no number has only prime factors.
A number with only two factors - 1 and itself - is known as a prime number.