Mathematicians just collectively gasped! This poor guy thought claiming 1 as his favorite prime number would impress his date's dad, but instead earned an immediate eviction notice.
Here's the mathematical heartbreak: 1 is NOT a prime number because prime numbers must have exactly two distinct factors (1 and themselves). The number 1 only has one factor—itself! This mathematical faux pas is like showing up to a physics conference claiming your favorite particle is the "electronium" or telling a chemist you love the element "surprisium."
Dad's giving him one second to leave because that's approximately how long it takes for a mathematician to lose respect for someone who doesn't know their prime numbers. Dating tip: maybe stick to "I like your daughter" instead of faking mathematical knowledge!