It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 665 019 is not a prime number.
For example, 42 665 019 can be divided by 3: 42 665 019 / 3 = 14 221 673.
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For 42 665 019 to be a prime number, it would have been required that 42 665 019 has only two divisors, i.e., itself and 1.
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42 665 019 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 42 665 019 is about 6 531.847.
Thus, the square root of 42 665 019 is not an integer, and therefore 42 665 019 is not a square number.
The square of a number (here 42 665 019) is the result of the product of this number (42 665 019) by itself (i.e., 42 665 019 × 42 665 019); the square of 42 665 019 is sometimes called "raising 42 665 019 to the power 2", or "42 665 019 squared".
The square of 42 665 019 is 1 820 303 846 270 361 because 42 665 019 × 42 665 019 = 42 665 0192 = 1 820 303 846 270 361.
As a consequence, 42 665 019 is the square root of 1 820 303 846 270 361.
42 665 019 is a number with 8 digits.
The multiples of 42 665 019 are all integers evenly divisible by 42 665 019, that is all numbers such that the remainder of the division by 42 665 019 is zero. There are infinitely many multiples of 42 665 019. The smallest multiples of 42 665 019 are: