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If it is a composite number, it is divisible by at least one prime number.
A composite number is a number that has at least 3 factors. (It can be evenly divided by at least 3 number.) 25 has 3 factors: 1, 5, and 25.
747 is a composite number because it has at least one positive factor other than one or itself.
Yes, 20 is a composite number because it has at least one positive factor other than one or itself.
Yes, 50 is a composite number because it has at least one positive factor other than one or itself.