It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 787 678 is not a prime number.
For example, 787 678 can be divided by 2: 787 678 / 2 = 393 839.
For 787 678 to be a prime number, it would have been required that 787 678 has only two divisors, i.e., itself and 1.
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787 678 is an even number, because it is evenly divisible by 2: 787 678 / 2 = 393 839.
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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 787 678 is about 887.512.
Thus, the square root of 787 678 is not an integer, and therefore 787 678 is not a square number.
The square of a number (here 787 678) is the result of the product of this number (787 678) by itself (i.e., 787 678 × 787 678); the square of 787 678 is sometimes called "raising 787 678 to the power 2", or "787 678 squared".
The square of 787 678 is 620 436 631 684 because 787 678 × 787 678 = 787 6782 = 620 436 631 684.
As a consequence, 787 678 is the square root of 620 436 631 684.
The multiples of 787 678 are all integers evenly divisible by 787 678, that is all numbers such that the remainder of the division by 787 678 is zero. There are infinitely many multiples of 787 678. The smallest multiples of 787 678 are: