Factors are integers that multiply to create a product.
3 x 4 = 12
3 and 4 are factors of 12.
Divisibility refers to a number capable of being divided by another number without a remainder: 24 is divisible by 4.
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Oh, dude, there are like a bazillion different arrays you can make with 18. Okay, maybe not a bazillion, but definitely a lot. You can have arrays like [1, 2, 3, 4, 5, 6], [18], [9, 9], or even [2, 9, 7]. The possibilities are endless... well, not really, but you get the point.
The last draw has no bearing on the next draw. Each draw is random.
12, 14, and 20 have an even number of factors. 4, 9, and 16 also have an even number of factors, but since they're perfect squares, two of the factors are the same number in each case, so each appears to have an odd number of factors.
Just one. Or, two if you count (1, p) and (p, 1) as being different.
Prime numbers have as factors the number 1 and their own number. Example: 37 is a prime number because its only factors are "1" and "37". If the prime number had further factors, it would no longer be prime.