is apple watch series 2 waterproof

It is not waterproof. But it is water resistant.

About Apple Watch water resistance - Apple Support

Apple Watch Series 2 and newer may be used for shallow water activities like swimming in a pool or ocean. However, Apple Watch Series 2 and newer shouldn't be used for scuba diving, water skiing, or other activities involving high velocity water or submersion below shallow depth.

Hi Here2discuss,

Yes, the Apple Watch series 2 and all later models are water-resistant up to 50m,

Hope this helped,

Colm

No,the apple watch is not waterproof it is water resistant,read here;

About Apple Watch water resistance - Apple Support

Quote from the above support document;

Is my Apple Watch waterproof?

Your Apple Watch is water resistant, but not waterproof.* For example, you may wear and use your Apple Watch during exercise (exposure to sweat is OK), in the rain, and while washing your hands.