9 is a compostie number because it is divisible by 3. A prime number is only divisible by 1 and itself.
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As a product of its prime factors: 3*3*5*7 = 315
210 is not prime. 210 = 2 * 3 * 5 * 7
245 is not prime. Composite: (5 x 49 or 5 x 7 x 7) Also you can automatically determine a number as composite if: it ends with 2, 4, 6, 8, and 0: multiples of 2; or it ends with 5: multiples of 5.
1155 is a composite number because it ends with 5. All numbers that end with 5 except 5 itself are composite numbers because they are divisible by 5, which means there are at least three factors, 1, 5, and the number itself.
compositeSixty-five is a composite number because it is divisible by five. If a number can be divide by another one, then that number is composite. Numbers like 3, 5, 7, and 11 are all prime numbers because they cannot be divided by any other number.65 is composite, as is any number of 2 or more digits ending in 5.