It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 398 742 is not a prime number.
For example, 398 742 can be divided by 2: 398 742 / 2 = 199 371.
For 398 742 to be a prime number, it would have been required that 398 742 has only two divisors, i.e., itself and 1.
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398 742 is an even number, because it is evenly divisible by 2: 398 742 / 2 = 199 371.
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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 398 742 is about 631.460.
Thus, the square root of 398 742 is not an integer, and therefore 398 742 is not a square number.
The square of a number (here 398 742) is the result of the product of this number (398 742) by itself (i.e., 398 742 × 398 742); the square of 398 742 is sometimes called "raising 398 742 to the power 2", or "398 742 squared".
The square of 398 742 is 158 995 182 564 because 398 742 × 398 742 = 398 7422 = 158 995 182 564.
As a consequence, 398 742 is the square root of 158 995 182 564.
The multiples of 398 742 are all integers evenly divisible by 398 742, that is all numbers such that the remainder of the division by 398 742 is zero. There are infinitely many multiples of 398 742. The smallest multiples of 398 742 are: