It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 009 838 is not a prime number.
For example, 42 009 838 can be divided by 2: 42 009 838 / 2 = 21 004 919.
For 42 009 838 to be a prime number, it would have been required that 42 009 838 has only two divisors, i.e., itself and 1.
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42 009 838 is an even number, because it is evenly divisible by 2: 42 009 838 / 2 = 21 004 919.
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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 42 009 838 is about 6 481.500.
Thus, the square root of 42 009 838 is not an integer, and therefore 42 009 838 is not a square number.
The square of a number (here 42 009 838) is the result of the product of this number (42 009 838) by itself (i.e., 42 009 838 × 42 009 838); the square of 42 009 838 is sometimes called "raising 42 009 838 to the power 2", or "42 009 838 squared".
The square of 42 009 838 is 1 764 826 488 786 244 because 42 009 838 × 42 009 838 = 42 009 8382 = 1 764 826 488 786 244.
As a consequence, 42 009 838 is the square root of 1 764 826 488 786 244.
42 009 838 is a number with 8 digits.
The multiples of 42 009 838 are all integers evenly divisible by 42 009 838, that is all numbers such that the remainder of the division by 42 009 838 is zero. There are infinitely many multiples of 42 009 838. The smallest multiples of 42 009 838 are: