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.
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1997 is already prime; no tree.
You is called a prime number!You is called a prime number!You is called a prime number!You is called a prime number!
There are 25 prime number years in the 20th century. Prime number years are those that have only two factors: 1 and the number itself. The 20th century spans from 1901 to 2000, and the prime number years within this range are: 1901, 1907, 1911, 1913, 1917, 1919, 1931, 1933, 1939, 1949, 1951, 1957, 1959, 1961, 1963, 1973, 1979, 1987, 1993, 1997.
A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.
101 is a prime number. The only factor of 101 is itself and 1.prime