How can you know if a hamster is a male or female?

When you examine the lower belly of the hamster you should be able to identify two openings. The one closest to the tail is the anal opening, and the one higher up is the sexual opening. There will be a greater distance between the two holes if it is a male than there will be if it is a female. Different breeds are slightly different. If it is a male, you may also notice a scent gland higher up on the tummy than the openings, and sometimes even a scrotal bulge near the tail.

Other

This works with almost all rodents, if you look under a male's tail you will see his testicles, which look like a little pink butt. A female does not have this. This only works on I adults. If it is a Syrian hamster don't touch them until they leave the nest or start exploring.

take it to a vet

You can tell if its a male or female by the way it wees. if its a male a stick thing called a penus comes out from it and if its a female it squats down and wee comes out of its virgina

check for balls. they will be large on the male

You will know trust me. Male hamsters have huge balls. I kid you not.

determine gender of your hamsters? Well, it's pretty easy to identify (as long as you know how) especially when they are sexually matured. (Easier to say I think because I did mixed up my hammys once).

Basically the male exhibits large, pronounced testicles and scrotal sack, and the anogenital distance is greater. The opposite is true for the female, as in most rodent species, where the anogenital distance is less than that if the male.

Hold tour hamster up and look at it's urine holes.if their closer together,your hamster is a female.If it is wider aprt then it is a male.