It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 690 674 is not a prime number.
For example, 690 674 can be divided by 2: 690 674 / 2 = 345 337.
For 690 674 to be a prime number, it would have been required that 690 674 has only two divisors, i.e., itself and 1.
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690 674 is an even number, because it is evenly divisible by 2: 690 674 / 2 = 345 337.
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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 690 674 is about 831.068.
Thus, the square root of 690 674 is not an integer, and therefore 690 674 is not a square number.
The square of a number (here 690 674) is the result of the product of this number (690 674) by itself (i.e., 690 674 × 690 674); the square of 690 674 is sometimes called "raising 690 674 to the power 2", or "690 674 squared".
The square of 690 674 is 477 030 574 276 because 690 674 × 690 674 = 690 6742 = 477 030 574 276.
As a consequence, 690 674 is the square root of 477 030 574 276.
The multiples of 690 674 are all integers evenly divisible by 690 674, that is all numbers such that the remainder of the division by 690 674 is zero. There are infinitely many multiples of 690 674. The smallest multiples of 690 674 are: