It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 007 126 is not a prime number.
For example, 42 007 126 can be divided by 2: 42 007 126 / 2 = 21 003 563.
For 42 007 126 to be a prime number, it would have been required that 42 007 126 has only two divisors, i.e., itself and 1.
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42 007 126 is an even number, because it is evenly divisible by 2: 42 007 126 / 2 = 21 003 563.
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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 42 007 126 is about 6 481.290.
Thus, the square root of 42 007 126 is not an integer, and therefore 42 007 126 is not a square number.
The square of a number (here 42 007 126) is the result of the product of this number (42 007 126) by itself (i.e., 42 007 126 × 42 007 126); the square of 42 007 126 is sometimes called "raising 42 007 126 to the power 2", or "42 007 126 squared".
The square of 42 007 126 is 1 764 598 634 779 876 because 42 007 126 × 42 007 126 = 42 007 1262 = 1 764 598 634 779 876.
As a consequence, 42 007 126 is the square root of 1 764 598 634 779 876.
42 007 126 is a number with 8 digits.
The multiples of 42 007 126 are all integers evenly divisible by 42 007 126, that is all numbers such that the remainder of the division by 42 007 126 is zero. There are infinitely many multiples of 42 007 126. The smallest multiples of 42 007 126 are: