4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
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Look for a table of prime numbers. All the odd numbers that are NOT on this list are composite numbers.
All square numbers greater than 1 are composite.
The composite numbers between 1000 and 1005 are numbers that have factors other than 1 and themselves. In this range, the numbers 1001, 1002, 1003, and 1004 are composite numbers. 1000 is not a composite number because it is divisible by 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, and 1000.
Since 20 is evenly divisible by 2, 4, 5, and 10, in addition to '1' and itself, I think it is a composite number.Since 20 is evenly divisible by 2, 4, 5, and 10, in addition to '1' and itself, I think it's probably composite.
20 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.