It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 438 678 is not a prime number.
For example, 438 678 can be divided by 2: 438 678 / 2 = 219 339.
For 438 678 to be a prime number, it would have been required that 438 678 has only two divisors, i.e., itself and 1.
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438 678 is an even number, because it is evenly divisible by 2: 438 678 / 2 = 219 339.
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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 438 678 is about 662.328.
Thus, the square root of 438 678 is not an integer, and therefore 438 678 is not a square number.
The square of a number (here 438 678) is the result of the product of this number (438 678) by itself (i.e., 438 678 × 438 678); the square of 438 678 is sometimes called "raising 438 678 to the power 2", or "438 678 squared".
The square of 438 678 is 192 438 387 684 because 438 678 × 438 678 = 438 6782 = 192 438 387 684.
As a consequence, 438 678 is the square root of 192 438 387 684.
The multiples of 438 678 are all integers evenly divisible by 438 678, that is all numbers such that the remainder of the division by 438 678 is zero. There are infinitely many multiples of 438 678. The smallest multiples of 438 678 are: