have hprime : Prime a := UniqueFactorizationMonoid.prime_of_normalized_factor a ha
case h.e'_2
x : ℕ
hx : ¬x = 0
a : ℕ
ha : a ∈ UniqueFactorizationMonoid.normalizedFactors x
⊢ a = 2 ∨ Odd a
case h.e'_2
x : ℕ
hx : ¬x = 0
a : ℕ
ha : a ∈ UniqueFactorizationMonoid.normalizedFactors x
hprime : Prime a
⊢ a = 2 ∨ Odd a