No, it is a composite number
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One quadrillion.
It is 1 333333333333333/1000000000000000.
It is 20408163265306/1000000000000000, which you can simplify if you so wish.
1.352941176470588 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 1352941176470588/1000000000000000. You can simplify this rational fraction if you require.
It is not a prime.