is apple watch series 2 waterproof

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.

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