It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 698 518 is not a prime number.
For example, 698 518 can be divided by 2: 698 518 / 2 = 349 259.
For 698 518 to be a prime number, it would have been required that 698 518 has only two divisors, i.e., itself and 1.
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698 518 is an even number, because it is evenly divisible by 2: 698 518 / 2 = 349 259.
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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 698 518 is about 835.774.
Thus, the square root of 698 518 is not an integer, and therefore 698 518 is not a square number.
The square of a number (here 698 518) is the result of the product of this number (698 518) by itself (i.e., 698 518 × 698 518); the square of 698 518 is sometimes called "raising 698 518 to the power 2", or "698 518 squared".
The square of 698 518 is 487 927 396 324 because 698 518 × 698 518 = 698 5182 = 487 927 396 324.
As a consequence, 698 518 is the square root of 487 927 396 324.
The multiples of 698 518 are all integers evenly divisible by 698 518, that is all numbers such that the remainder of the division by 698 518 is zero. There are infinitely many multiples of 698 518. The smallest multiples of 698 518 are: