toI(s=readline()) = parse(Int,s)
toVI(s=readline()) = toI.(split(s))
rep(f,n) = [f() for _ in 1:n]
pYesNo(b) = ifelse(b,"Yes","No") |> println

function main()
	n = toI()
	solve(n) |> pYesNo
end

function solve(n)
	length(factor(n)) ≤ 2
end

function factor(n)
	xs = Pair{Int,Int}[]
	n == 1 && return xs
	x = n
	for i in 2:isqrt(n)
		x % i == 0 || continue
		cnt = 0
		while x % i == 0
			cnt += 1
			x ÷= i
		end
		push!(xs,i=>cnt)
	end
	if x > 1
		push!(xs,x=>1)
	end
	xs
end

main()