It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 338 949 is not a prime number.
For example, 400 338 949 can be divided by 19: 400 338 949 / 19 = 21 070 471.
For 400 338 949 to be a prime number, it would have been required that 400 338 949 has only two divisors, i.e., itself and 1.
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400 338 949 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 400 338 949 is about 20 008.472.
Thus, the square root of 400 338 949 is not an integer, and therefore 400 338 949 is not a square number.
The square of a number (here 400 338 949) is the result of the product of this number (400 338 949) by itself (i.e., 400 338 949 × 400 338 949); the square of 400 338 949 is sometimes called "raising 400 338 949 to the power 2", or "400 338 949 squared".
The square of 400 338 949 is 160 271 274 086 424 608 because 400 338 949 × 400 338 949 = 400 338 9492 = 160 271 274 086 424 608.
As a consequence, 400 338 949 is the square root of 160 271 274 086 424 608.
400 338 949 is a number with 9 digits.
The multiples of 400 338 949 are all integers evenly divisible by 400 338 949, that is all numbers such that the remainder of the division by 400 338 949 is zero. There are infinitely many multiples of 400 338 949. The smallest multiples of 400 338 949 are: