It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 443 721 is not a prime number.
For example, 402 443 721 can be divided by 3: 402 443 721 / 3 = 134 147 907.
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For 402 443 721 to be a prime number, it would have been required that 402 443 721 has only two divisors, i.e., itself and 1.
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402 443 721 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 402 443 721 is 20 061.
Therefore, the square root of 402 443 721 is an integer, and as a consequence 402 443 721 is a perfect square.
As a consequence, 20 061 is the square root of 402 443 721.
The square of a number (here 402 443 721) is the result of the product of this number (402 443 721) by itself (i.e., 402 443 721 × 402 443 721); the square of 402 443 721 is sometimes called "raising 402 443 721 to the power 2", or "402 443 721 squared".
The square of 402 443 721 is 161 960 948 572 325 856 because 402 443 721 × 402 443 721 = 402 443 7212 = 161 960 948 572 325 856.
As a consequence, 402 443 721 is the square root of 161 960 948 572 325 856.
402 443 721 is a number with 9 digits.
The multiples of 402 443 721 are all integers evenly divisible by 402 443 721, that is all numbers such that the remainder of the division by 402 443 721 is zero. There are infinitely many multiples of 402 443 721. The smallest multiples of 402 443 721 are: