It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 789 674 is not a prime number.
For example, 789 674 can be divided by 2: 789 674 / 2 = 394 837.
For 789 674 to be a prime number, it would have been required that 789 674 has only two divisors, i.e., itself and 1.
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789 674 is an even number, because it is evenly divisible by 2: 789 674 / 2 = 394 837.
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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 789 674 is about 888.636.
Thus, the square root of 789 674 is not an integer, and therefore 789 674 is not a square number.
The square of a number (here 789 674) is the result of the product of this number (789 674) by itself (i.e., 789 674 × 789 674); the square of 789 674 is sometimes called "raising 789 674 to the power 2", or "789 674 squared".
The square of 789 674 is 623 585 026 276 because 789 674 × 789 674 = 789 6742 = 623 585 026 276.
As a consequence, 789 674 is the square root of 623 585 026 276.
The multiples of 789 674 are all integers evenly divisible by 789 674, that is all numbers such that the remainder of the division by 789 674 is zero. There are infinitely many multiples of 789 674. The smallest multiples of 789 674 are: