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It is a composite number and a number with only two factors is a prime number
51 is a composite number because it has more than two factors.
If a number has more than two factors then it is a composite number
A number that has only two factors is prime. A number that has more than two factors is composite.
There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.