As an even number greater than 2, 618 is divisible by 2 and therefore not a Prime number.
No, 618 is not a prime number, as it can be divided by 3.
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618 is even, and thus divides by 2, and so must be a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.
1, 2, 3, 6, 103, 206, 309, 6182, 3 and 103 are prime.
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The next number in the series 3, 618, 72, is -1635. The relevant rule is Un = (-1161n2 + 4713n - 3546)/2 for n = 1, 2, 3, ...
3n = 618 n = 618 ÷ 3 n = 206