It must have at least 3 factors.
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Any composite number has three or more factors.
121 is a composite number, having the three factors 1, 11, and 121. A prime number has only two factors, 1 and itself.
Any square of a prime number, like 9.
Yes, a composite number has to have at least one factor other than 1 and itself, so they have to have at least 3 factors.
12 is a composite number. Its factors are 1, 2, 3, 4, 6, and 12. 4 is also a composite number. Its factors are 1, 2, and 4. Any number that has factors in addition to 1 and itself is a composite number.