It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 121 209 is not a prime number.
For example, 121 209 can be divided by 3: 121 209 / 3 = 40 403.
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For 121 209 to be a prime number, it would have been required that 121 209 has only two divisors, i.e., itself and 1.
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121 209 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 121 209 is about 348.151.
Thus, the square root of 121 209 is not an integer, and therefore 121 209 is not a square number.
The square of a number (here 121 209) is the result of the product of this number (121 209) by itself (i.e., 121 209 × 121 209); the square of 121 209 is sometimes called "raising 121 209 to the power 2", or "121 209 squared".
The square of 121 209 is 14 691 621 681 because 121 209 × 121 209 = 121 2092 = 14 691 621 681.
As a consequence, 121 209 is the square root of 14 691 621 681.
The multiples of 121 209 are all integers evenly divisible by 121 209, that is all numbers such that the remainder of the division by 121 209 is zero. There are infinitely many multiples of 121 209. The smallest multiples of 121 209 are: