It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 009 839 is not a prime number.
For example, 42 009 839 can be divided by 17: 42 009 839 / 17 = 2 471 167.
For 42 009 839 to be a prime number, it would have been required that 42 009 839 has only two divisors, i.e., itself and 1.
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42 009 839 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 42 009 839 is about 6 481.500.
Thus, the square root of 42 009 839 is not an integer, and therefore 42 009 839 is not a square number.
The square of a number (here 42 009 839) is the result of the product of this number (42 009 839) by itself (i.e., 42 009 839 × 42 009 839); the square of 42 009 839 is sometimes called "raising 42 009 839 to the power 2", or "42 009 839 squared".
The square of 42 009 839 is 1 764 826 572 805 921 because 42 009 839 × 42 009 839 = 42 009 8392 = 1 764 826 572 805 921.
As a consequence, 42 009 839 is the square root of 1 764 826 572 805 921.
42 009 839 is a number with 8 digits.
The multiples of 42 009 839 are all integers evenly divisible by 42 009 839, that is all numbers such that the remainder of the division by 42 009 839 is zero. There are infinitely many multiples of 42 009 839. The smallest multiples of 42 009 839 are: