# your code goes here
#prime
N=int(input())
C=0
i=2
while C<2 and i*i<=N:
    if N%i==0:
        C+=1
        N//=i
        while C<2 and N%i==0:
            C+=1
            N//=i
    i+=1
if C==2 and N>1:
    print("YES")
else:
    print("NO")