It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 346 518 is not a prime number.
For example, 346 518 can be divided by 2: 346 518 / 2 = 173 259.
For 346 518 to be a prime number, it would have been required that 346 518 has only two divisors, i.e., itself and 1.
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346 518 is an even number, because it is evenly divisible by 2: 346 518 / 2 = 173 259.
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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 346 518 is about 588.658.
Thus, the square root of 346 518 is not an integer, and therefore 346 518 is not a square number.
The square of a number (here 346 518) is the result of the product of this number (346 518) by itself (i.e., 346 518 × 346 518); the square of 346 518 is sometimes called "raising 346 518 to the power 2", or "346 518 squared".
The square of 346 518 is 120 074 724 324 because 346 518 × 346 518 = 346 5182 = 120 074 724 324.
As a consequence, 346 518 is the square root of 120 074 724 324.
The multiples of 346 518 are all integers evenly divisible by 346 518, that is all numbers such that the remainder of the division by 346 518 is zero. There are infinitely many multiples of 346 518. The smallest multiples of 346 518 are: