It's hardly odd.
"Even" just means "divisible by 2"
"2 is the only prime that is divisible by 2" "3 is the only prime that is divisible by 3" "5 is the only prime that is divisible by 5"
...
"N is the only prime that is divisible by N"
"Even" just means "divisible by 2"
"2 is the only prime that is divisible by 2" "3 is the only prime that is divisible by 3" "5 is the only prime that is divisible by 5"
...
"N is the only prime that is divisible by N"