Visit Visa Valid or Not ?

Hi Brothers/Sisters ,
This is Mohamed. Please help me on the below queries.

I got an offer in a company , They are providing me a visit visa for one year (Multiple Entry). They promised to give Iqama after an year /  I got Permanent. As of now, I got an offer letter and Visit Visa from this Saudi Company.

1) Is this enough to believe the company ?
2) Do I need to check the Visit Visa number ? (like,  it is valid or not)
   - if yes , where and How can I check that ?

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