It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 688 998 is not a prime number.
For example, 688 998 can be divided by 2: 688 998 / 2 = 344 499.
For 688 998 to be a prime number, it would have been required that 688 998 has only two divisors, i.e., itself and 1.
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688 998 is an even number, because it is evenly divisible by 2: 688 998 / 2 = 344 499.
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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 688 998 is about 830.059.
Thus, the square root of 688 998 is not an integer, and therefore 688 998 is not a square number.
The square of a number (here 688 998) is the result of the product of this number (688 998) by itself (i.e., 688 998 × 688 998); the square of 688 998 is sometimes called "raising 688 998 to the power 2", or "688 998 squared".
The square of 688 998 is 474 718 244 004 because 688 998 × 688 998 = 688 9982 = 474 718 244 004.
As a consequence, 688 998 is the square root of 474 718 244 004.
The multiples of 688 998 are all integers evenly divisible by 688 998, that is all numbers such that the remainder of the division by 688 998 is zero. There are infinitely many multiples of 688 998. The smallest multiples of 688 998 are: