Zero is "divisible" by all whole numbers, but as the process is irreversible (you cannot divide by zero), I've always thought zero as "outside the system" of factoring.
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Yes, 12 has prime factors. The prime factors of 12 are 2, 2, and 3, so the distinct prime factors are 2 and 3. Almost all integers have prime factors. The integers without prime factors are -1, 0, and 1.
A prime number has two factors. A composite number has more than two factors.Since 0 has no factors, it is neither prime nor composite.
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. 71 is prime.
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. 13 is prime.
it is prime 59 is a prime number. 59 is a prime number because it has only 2 factors. 59 is a prime number. It has no factors other than 1 and itself.