It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 550 988 is not a prime number.
For example, 400 550 988 can be divided by 2: 400 550 988 / 2 = 200 275 494.
For 400 550 988 to be a prime number, it would have been required that 400 550 988 has only two divisors, i.e., itself and 1.
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400 550 988 is an even number, because it is evenly divisible by 2: 400 550 988 / 2 = 200 275 494.
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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 400 550 988 is about 20 013.770.
Thus, the square root of 400 550 988 is not an integer, and therefore 400 550 988 is not a square number.
The square of a number (here 400 550 988) is the result of the product of this number (400 550 988) by itself (i.e., 400 550 988 × 400 550 988); the square of 400 550 988 is sometimes called "raising 400 550 988 to the power 2", or "400 550 988 squared".
The square of 400 550 988 is 160 441 093 987 776 128 because 400 550 988 × 400 550 988 = 400 550 9882 = 160 441 093 987 776 128.
As a consequence, 400 550 988 is the square root of 160 441 093 987 776 128.
400 550 988 is a number with 9 digits.
The multiples of 400 550 988 are all integers evenly divisible by 400 550 988, that is all numbers such that the remainder of the division by 400 550 988 is zero. There are infinitely many multiples of 400 550 988. The smallest multiples of 400 550 988 are: