If you mean, "What are the factors of 378?", they are:
1, 2, 3, 6, 7, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, and 378.
If you mean, "What are the composite factors of 378?", they are:
6, 9, 14, 18, 21, 27, 42, 54, 63, 126, 189, and 378.
If you mean, "Which of 3, 7, and 8 are composite numbers?", the only one is 8.
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Yes: 378 / 2 = 189
No.
yes its 126
All numbers are divisible by 1.
Prime numbers are divisible because any numbers that are divisible are prime. If a number isn't divisible, it isn't prime. Prime numbers have to be divisible by at least one pair of numbers to be prime.