It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 690 678 is not a prime number.
For example, 690 678 can be divided by 2: 690 678 / 2 = 345 339.
For 690 678 to be a prime number, it would have been required that 690 678 has only two divisors, i.e., itself and 1.
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690 678 is an even number, because it is evenly divisible by 2: 690 678 / 2 = 345 339.
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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 690 678 is about 831.070.
Thus, the square root of 690 678 is not an integer, and therefore 690 678 is not a square number.
The square of a number (here 690 678) is the result of the product of this number (690 678) by itself (i.e., 690 678 × 690 678); the square of 690 678 is sometimes called "raising 690 678 to the power 2", or "690 678 squared".
The square of 690 678 is 477 036 099 684 because 690 678 × 690 678 = 690 6782 = 477 036 099 684.
As a consequence, 690 678 is the square root of 477 036 099 684.
The multiples of 690 678 are all integers evenly divisible by 690 678, that is all numbers such that the remainder of the division by 690 678 is zero. There are infinitely many multiples of 690 678. The smallest multiples of 690 678 are: