The best thing to do is take it to a dealer or collector for their opinion.
A real silver dollar has "Miss Liberty" on it.
The first real person on a dollar coin was President Eisenhower in 1971. No silver dollar coins have portraits of real people.
If the coin is a real Morgan or Peace dollar. The value is just for the silver, about $20.00.
This is not a real coin. They make these for practical jokes.
Yes, what little silver is in (or on) the coin is real silver.
The first US silver dollar coin was struck in 1794 the designer was Robert Scot. Lady Liberty is not a real person.
Most non-collectors use the generic term 'Silver Dollar" for any one dollar coin. Only dollar coins from 1971 to date have real people on them. Older real silver dollars from 1794 to 1935 have different stylized portraits of Miss Liberty. Post a new question with a date
Take it to a local coin collector and see what he or she says.
In 1979, the dollar coin issued by the US was the Susan B. Anthony, which has no silver content and no real collector's value, so is a "spender".
The most basic thing is the weight and diameter of the coin. if you have doubts about the authenticity of the coin, take it to a coin dealer for an assessment.
Go to a coin shop or a jeweler who deals in coins and buy one.