Think of primes as the introverts of the math world. They only hang out with two friends: 1 and themselves. Composites? Oh, they’re the social butterflies, divisible by all sorts of numbers—3, 4, 5, you name it. So, which one is 17? Spoiler: it’s a total introvert.
Try to divide 17 by anything other than 1 and 17. Go ahead, I’ll wait. 2? Nope, that gives you 8.5 (ew, decimals). 3? Not quite, you get 5.66. 4? No dice. 17 is stubborn, and honestly, I respect that.