LCM( 13, 2197 ) = 2197
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 13, b = 2197 and GCD(13, 2197) = 13.
$$ \text{LCM} (13, 2197) = \frac{ 13 \cdot 2197 }{ \text{GCD}(13,2197)} = \frac{ 28561 }{ 13 } = 2197 $$