You are using two numbers, $Nl$ and $N2($where $N1$ is greater than $N2)$ in an algorithm, Algol. The Algol uses a loop which runs from $I=1$ to $N2.$ Inside the loop, a condition, if$($N$1\%I=0$ & & $N2\%i=0)$ is checked, and if found true, then I is assigned in

$($A$)$To find factorial of $N1$ or $N2,$ whichever is bigger

$($B$)$ To find GCD of $N1$ and $N2$

$($C$)$ To find whether, $N2$ is odd number or even number.

$($D$)$ To find whether, $N2$ is prime number or not.