It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 78 731 is not a prime number.
For example, 78 731 can be divided by 131: 78 731 / 131 = 601.
For 78 731 to be a prime number, it would have been required that 78 731 has only two divisors, i.e., itself and 1.
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78 731 is an odd number, because it is not evenly divisible by 2.
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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 78 731 is about 280.590.
Thus, the square root of 78 731 is not an integer, and therefore 78 731 is not a square number.
The square of a number (here 78 731) is the result of the product of this number (78 731) by itself (i.e., 78 731 × 78 731); the square of 78 731 is sometimes called "raising 78 731 to the power 2", or "78 731 squared".
The square of 78 731 is 6 198 570 361 because 78 731 × 78 731 = 78 7312 = 6 198 570 361.
As a consequence, 78 731 is the square root of 6 198 570 361.
The multiples of 78 731 are all integers evenly divisible by 78 731, that is all numbers such that the remainder of the division by 78 731 is zero. There are infinitely many multiples of 78 731. The smallest multiples of 78 731 are: