It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 667 013 is not a prime number.
For example, 400 667 013 can be divided by 3: 400 667 013 / 3 = 133 555 671.
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For 400 667 013 to be a prime number, it would have been required that 400 667 013 has only two divisors, i.e., itself and 1.
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400 667 013 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 400 667 013 is about 20 016.668.
Thus, the square root of 400 667 013 is not an integer, and therefore 400 667 013 is not a square number.
The square of a number (here 400 667 013) is the result of the product of this number (400 667 013) by itself (i.e., 400 667 013 × 400 667 013); the square of 400 667 013 is sometimes called "raising 400 667 013 to the power 2", or "400 667 013 squared".
The square of 400 667 013 is 160 534 055 306 342 176 because 400 667 013 × 400 667 013 = 400 667 0132 = 160 534 055 306 342 176.
As a consequence, 400 667 013 is the square root of 160 534 055 306 342 176.
400 667 013 is a number with 9 digits.
The multiples of 400 667 013 are all integers evenly divisible by 400 667 013, that is all numbers such that the remainder of the division by 400 667 013 is zero. There are infinitely many multiples of 400 667 013. The smallest multiples of 400 667 013 are: