It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 343 121 is not a prime number.
For example, 343 121 can be divided by 19: 343 121 / 19 = 18 059.
For 343 121 to be a prime number, it would have been required that 343 121 has only two divisors, i.e., itself and 1.
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343 121 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 343 121 is about 585.765.
Thus, the square root of 343 121 is not an integer, and therefore 343 121 is not a square number.
The square of a number (here 343 121) is the result of the product of this number (343 121) by itself (i.e., 343 121 × 343 121); the square of 343 121 is sometimes called "raising 343 121 to the power 2", or "343 121 squared".
The square of 343 121 is 117 732 020 641 because 343 121 × 343 121 = 343 1212 = 117 732 020 641.
As a consequence, 343 121 is the square root of 117 732 020 641.
The multiples of 343 121 are all integers evenly divisible by 343 121, that is all numbers such that the remainder of the division by 343 121 is zero. There are infinitely many multiples of 343 121. The smallest multiples of 343 121 are: