A Prime number is a natural number with only two numbers: itself and 1.
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A positive integer with only two factors: one and the number itself.
It is a composite number because it has more than two factors
A prime number has only two factors which are itself and one whereas a composite number has more than two factors
90 is a composite number because it has more than two factors
no 4 is not a prime number because the factors are 1 and 2 and 4. Not 1 and 4 only