refine not_prime_of_int_mul' (left_factor_large (n : ℤ) h2) (right_factor_large (n : ℤ) h2) ?_
m : ℕ
h1 : 1 < m
n : ℕ
h2 : 1 < ↑m
⊢ ¬(n ^ 4 + 4 * m ^ 4).Prime
m : ℕ
h1 : 1 < m
n : ℕ
h2 : 1 < ↑m
⊢ ((↑n - ↑m) ^ 2 + ↑m ^ 2) * ((↑n + ↑m) ^ 2 + ↑m ^ 2) = ↑(n ^ 4 + 4 * m ^ 4)