When referring to positive integers, prime means having only two factors and composite means having more than two.
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A Prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0. 1, 2, and 0 have a different name.
350 is a composite number. it can be divisible by 10, 35, 5, 2 etc. You will find it easier to tell between prime and composite if you know the divisibility rules. one simple one is that if a number ends with zero it is divisible by 10...there are a lot of other divisibility rules.
It is prime
they have to be composite
86 is not a prime number, so is a composite.
No 168 is not a prime number it is a composite number