It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 678 498 is not a prime number.
For example, 678 498 can be divided by 2: 678 498 / 2 = 339 249.
For 678 498 to be a prime number, it would have been required that 678 498 has only two divisors, i.e., itself and 1.
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678 498 is an even number, because it is evenly divisible by 2: 678 498 / 2 = 339 249.
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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 678 498 is about 823.710.
Thus, the square root of 678 498 is not an integer, and therefore 678 498 is not a square number.
The square of a number (here 678 498) is the result of the product of this number (678 498) by itself (i.e., 678 498 × 678 498); the square of 678 498 is sometimes called "raising 678 498 to the power 2", or "678 498 squared".
The square of 678 498 is 460 359 536 004 because 678 498 × 678 498 = 678 4982 = 460 359 536 004.
As a consequence, 678 498 is the square root of 460 359 536 004.
The multiples of 678 498 are all integers evenly divisible by 678 498, that is all numbers such that the remainder of the division by 678 498 is zero. There are infinitely many multiples of 678 498. The smallest multiples of 678 498 are: