It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 601 998 is not a prime number.
For example, 400 601 998 can be divided by 2: 400 601 998 / 2 = 200 300 999.
For 400 601 998 to be a prime number, it would have been required that 400 601 998 has only two divisors, i.e., itself and 1.
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400 601 998 is an even number, because it is evenly divisible by 2: 400 601 998 / 2 = 200 300 999.
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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 400 601 998 is about 20 015.044.
Thus, the square root of 400 601 998 is not an integer, and therefore 400 601 998 is not a square number.
The square of a number (here 400 601 998) is the result of the product of this number (400 601 998) by itself (i.e., 400 601 998 × 400 601 998); the square of 400 601 998 is sometimes called "raising 400 601 998 to the power 2", or "400 601 998 squared".
The square of 400 601 998 is 160 481 960 801 592 000 because 400 601 998 × 400 601 998 = 400 601 9982 = 160 481 960 801 592 000.
As a consequence, 400 601 998 is the square root of 160 481 960 801 592 000.
400 601 998 is a number with 9 digits.
The multiples of 400 601 998 are all integers evenly divisible by 400 601 998, that is all numbers such that the remainder of the division by 400 601 998 is zero. There are infinitely many multiples of 400 601 998. The smallest multiples of 400 601 998 are: