It is 1997.0 dollars.
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1 troy ounce. They are known as silver eagles and have the bullion value on the back.
8-4-11>>> This is a American Silver Eagle 1 ounce bullion coin. It is one ounce of pure silver.
1997 is already prime; no tree.
Yes it is. The square root of 1997 is between 44 and 45, so an exhaustive check of possible factors only requires testing divisibility by the following list of potential prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, and 43.