It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 789 138 is not a prime number.
For example, 42 789 138 can be divided by 2: 42 789 138 / 2 = 21 394 569.
For 42 789 138 to be a prime number, it would have been required that 42 789 138 has only two divisors, i.e., itself and 1.
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42 789 138 is an even number, because it is evenly divisible by 2: 42 789 138 / 2 = 21 394 569.
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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 42 789 138 is about 6 541.341.
Thus, the square root of 42 789 138 is not an integer, and therefore 42 789 138 is not a square number.
The square of a number (here 42 789 138) is the result of the product of this number (42 789 138) by itself (i.e., 42 789 138 × 42 789 138); the square of 42 789 138 is sometimes called "raising 42 789 138 to the power 2", or "42 789 138 squared".
The square of 42 789 138 is 1 830 910 330 783 044 because 42 789 138 × 42 789 138 = 42 789 1382 = 1 830 910 330 783 044.
As a consequence, 42 789 138 is the square root of 1 830 910 330 783 044.
42 789 138 is a number with 8 digits.
The multiples of 42 789 138 are all integers evenly divisible by 42 789 138, that is all numbers such that the remainder of the division by 42 789 138 is zero. There are infinitely many multiples of 42 789 138. The smallest multiples of 42 789 138 are: