or another stupid, but viable way to do it,

if number = 0:

return true

runloop = true

while runloop:

if number > 0:

number -= 2

else:

number += 2

if number = 1:

return false

runloop = false

if number = 2:

return true

runloop = false

still very shitty amature coding, doesn't depend on modulos, or anything that I can think of that some languages might lack an equivelant of.