It is composite. Any number ending in 0 is composite as both 2 and 5 are factors.
770 is even which means it must be divisible by 2, the only even prime, so it must be composite.
770 = 2 x 5 x 7 x 11
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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. 770 is composite.
770 is composite like all even numbers greater than 2.
It is prime
86 is not a prime number, so is a composite.
No 168 is not a prime number it is a composite number