It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 397 is not a prime number.
For example, 121 397 can be divided by 17: 121 397 / 17 = 7 141.
For 121 397 to be a prime number, it would have been required that 121 397 has only two divisors, i.e., itself and 1.
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121 397 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 121 397 is about 348.421.
Thus, the square root of 121 397 is not an integer, and therefore 121 397 is not a square number.
The square of a number (here 121 397) is the result of the product of this number (121 397) by itself (i.e., 121 397 × 121 397); the square of 121 397 is sometimes called "raising 121 397 to the power 2", or "121 397 squared".
The square of 121 397 is 14 737 231 609 because 121 397 × 121 397 = 121 3972 = 14 737 231 609.
As a consequence, 121 397 is the square root of 14 737 231 609.
The multiples of 121 397 are all integers evenly divisible by 121 397, that is all numbers such that the remainder of the division by 121 397 is zero. There are infinitely many multiples of 121 397. The smallest multiples of 121 397 are: